Fire Extinguisher Colours Explained: A Complete UK Guide
UK fire extinguisher colours identify the extinguishing medium inside the extinguisher; they do not, by themselves, confirm that it is suitable for every fire. Most modern portable extinguishers are red, with a coloured identification panel: cream for foam, blue for general dry powder, black for carbon dioxide and yellow for wet chemical.
Specialist Class D metal-fire powder is identified using signal violet. However, colour coding alone should never be used to decide whether an extinguisher is suitable for a fire.
For example, a water extinguisher may be suitable for burning paper or timber. Nevertheless, standard water equipment must not be used on live electrical equipment, burning cooking oil or flammable-liquid fires.
At
AK Fire Safety
,
we provide professional
fire extinguisher supply, commissioning, installation and servicing
for businesses and organisations across the United Kingdom.
What Do Fire Extinguisher Colours Mean?
The coloured identification panel on a UK fire extinguisher indicates the type of extinguishing medium contained within it.
- Red: water or certain water-based agents
- Cream: foam
- Blue: general dry powder
- Black: carbon dioxide
- Yellow: wet chemical
- Signal violet: specialist Class D metal-fire powder
Modern portable extinguishers are normally predominantly red. The smaller coloured area identifies the extinguishing agent.
Why Are Fire Extinguishers Colour Coded?
Colour coding provides a quick visual method of identifying the extinguishing agent. This can help trained users distinguish between different extinguishers positioned at the same fire point.
Colour identification can help people:
- Recognise the extinguishing medium.
- Distinguish between several extinguishers.
- Connect the extinguisher with suitable fire risks.
- Avoid selecting an obviously unsuitable agent.
- Complete routine inspections more efficiently.
Colour Does Not Confirm Every Approved Use
Two extinguishers with the same identification colour may have different fire ratings, discharge characteristics or restrictions. Always read the product label and operating instructions before use.
BS 5306-10 provides recommendations for the colour coding used to identify the extinguishing medium in portable fire extinguishers.
Further information about the current standard is available from the
British Standards Institution
.
What Does a Red Fire Extinguisher Label Mean?
A red identification label normally indicates a water or water-based fire extinguisher.
Water extinguishers are primarily intended for Class A fires involving solid combustible materials. They control suitable fires by absorbing heat and cooling the burning material.
Red-Label Water Extinguishers May Be Suitable For:
- Paper and cardboard
- Wood and timber
- Textiles and fabrics
- Furniture and furnishings
- Many ordinary Class A combustible materials
Standard Water Extinguishers Must Not Be Used On:
- Live electrical equipment
- Flammable liquids
- Flammable gases
- Cooking oils and fats
- Combustible metals
Are All Red-Label Extinguishers the Same?
No. Water-based products may include plain water, water spray, water with additives and water mist. Their certified fire ratings and electrical test approvals can differ.
Therefore, users must check the specific extinguisher label rather than assuming that every water-based product has identical capabilities.
What Does a Cream Fire Extinguisher Label Mean?
A cream identification label indicates a foam fire extinguisher.
Foam extinguishers are commonly selected for Class A solid combustible materials and suitable Class B flammable-liquid fires.
The foam can cool burning material. On compatible liquid fires, it can also spread across the fuel surface, reduce the release of flammable vapour and help prevent reignition.
Cream-Label Foam Extinguishers May Be Suitable For:
- Paper and cardboard
- Wood and textiles
- Furniture
- Petrol and diesel risks where appropriately rated
- Compatible paints and solvents
- Mixed Class A and Class B risks
Foam Extinguishers Are Generally Unsuitable For:
- High-temperature cooking oils
- Flammable gases
- Combustible metals
- Live electrical equipment unless specifically tested and approved
Foam Should Be Applied Carefully
Directing a powerful stream into burning liquid can splash or spread the fuel. Appropriate training is essential before attempting to use an extinguisher.
What Does a Blue Fire Extinguisher Label Mean?
A blue identification label normally indicates a general-purpose dry powder extinguisher.
ABC powder extinguishers can carry ratings for Class A, Class B and Class C fires. Dry powder works by interrupting the chemical reaction that allows flames to continue burning.
Blue-Label Powder May Be Considered For:
- Certain outdoor industrial risks
- Fuel-storage areas
- Some workshops
- Vehicle-related risks
- Flammable gas hazards
- Mixed outdoor Class A, B and C risks
Important Dry-Powder Limitations:
- Powder can significantly reduce visibility.
- Discharge can affect breathing.
- It can contaminate large indoor areas.
- Powder can damage sensitive equipment.
- It provides limited cooling.
- Reignition may occur.
General dry powder is not normally the preferred choice in offices, schools, care homes, healthcare facilities and other occupied indoor areas unless a competent assessment supports its use.
Blue Does Not Mean Class D Metal Powder
Current colour-coding guidance identifies specialist Class D metal-fire powder with signal violet rather than the blue identification used for general dry powder.
What Does a Black Fire Extinguisher Label Mean?
A black identification label indicates a carbon dioxide fire extinguisher, commonly called a CO₂ extinguisher.
CO₂ extinguishers are frequently selected for significant live electrical-equipment risks because the agent is electrically non-conductive and does not leave powder, foam or water residue.
Black-Label CO₂ Extinguishers May Be Suitable For:
- Computers and office electrical equipment
- Electrical control panels
- Switchgear
- Server and communications equipment
- Laboratory electrical equipment
- Some limited Class B liquid fires
CO₂ Extinguisher Limitations:
- It provides limited cooling.
- Deep-seated Class A fires can reignite.
- The gas disperses quickly outdoors.
- It is unsuitable for cooking-oil fires.
- It is unsuitable for combustible-metal fires.
- Discharge in confined spaces can reduce breathable air.
The CO₂ Horn Can Become Extremely Cold
Unless the extinguisher has a specially designed frost-free horn, touching the discharge horn during operation can cause a cold-contact injury. Users should hold only the designated handles and operating components.
Why Do CO₂ Extinguishers Not Usually Have Gauges?
CO₂ extinguishers normally store the agent as liquefied gas and do not generally use a conventional pressure gauge. Their contents are commonly assessed by weighing the extinguisher during maintenance.
What Does a Yellow Fire Extinguisher Label Mean?
A yellow identification label normally indicates a wet chemical fire extinguisher.
Wet chemical extinguishers are primarily designed for Class F fires involving high-temperature cooking oils and fats.
The extinguishing agent cools the burning oil and creates a soap-like sealing layer that reduces oxygen contact and helps prevent reignition.
Yellow-Label Wet Chemical Extinguishers Are Commonly Used In:
- Restaurants
- Commercial kitchens
- Takeaways
- Hotel kitchens
- School kitchens
- Care-home kitchens
- Premises containing commercial deep-fat fryers
Do Not Replace Class F Protection With:
- Standard water extinguishers
- Carbon dioxide extinguishers
- Standard foam extinguishers
- General powder without verified Class F approval
Never Use Water on Burning Cooking Oil
Water can rapidly turn into steam beneath hot oil and spread burning material beyond the appliance. Commercial cooking-oil risks require properly rated Class F protection.
The required wet chemical extinguisher should be selected according to the fryer size, oil capacity and certified Class F rating.
What Does a Signal-Violet Fire Extinguisher Label Mean?
Signal violet identifies specialist powder intended for Class D combustible-metal fires.
Different metals can react differently with extinguishing agents. Therefore, a Class D extinguisher must be selected specifically for the metal and process involved.
Class D Risks May Be Found In:
- Engineering workshops
- Metal-processing facilities
- Specialist manufacturing premises
- Laboratories
- Machining operations producing combustible swarf
- Areas containing reactive metal powders
Do Not Assume General Powder Is Suitable
A blue-label ABC powder extinguisher should not automatically be used on burning metals. Water, foam and unsuitable powder can react dangerously with certain combustible metals.
BAFE guidance states that specially formulated Class D powder should be used for fires involving combustible metals.
Read the
BAFE guidance for Class D fires
.
What Colour Is a Water-Mist Fire Extinguisher?
Water-mist extinguishers are water-based and therefore usually use red identification. However, their capabilities can vary considerably between products.
Some water-mist units may carry approval for several fire classes or particular electrical risks. Others may be designed mainly for Class A materials.
Check the Certified Product Ratings
The red identification colour does not confirm electrical suitability, Class F capability or performance on every fire type. Always examine the exact product label and manufacturer instructions.
UK Fire Extinguisher Colours Comparison Table
| Identification Colour | Extinguisher Medium | Common Applications | Important Limitations |
|---|---|---|---|
| Red | Water or water-based agent | Class A materials such as wood, paper, cardboard and textiles. | Standard water must not be used on live electrical equipment, flammable liquids or cooking oils. |
| Cream | Foam | Class A materials and suitable Class B flammable liquids. | Generally unsuitable for cooking oils, gases, metals and unapproved electrical use. |
| Blue | General dry powder | Selected outdoor Class A, B and C risks. | Reduces visibility, contaminates equipment and provides limited cooling. |
| Black | Carbon dioxide | Live electrical equipment and some limited Class B risks. | Provides limited cooling and can be ineffective outdoors. |
| Yellow | Wet chemical | Class F cooking oils and fats. | Primarily intended for specialist commercial-kitchen risks. |
| Signal violet | Specialist Class D powder | Specific combustible-metal fires. | The extinguishing agent must match the metal involved. |
Do Extinguisher Colours Match Fire Classes?
Extinguisher identification colours and fire classes are different systems.
The extinguisher colour identifies the extinguishing medium. In contrast, the fire class identifies the material or fuel that is burning.
Class A
Solid combustible materials such as paper, timber, textiles and many furnishings.
Class B
Flammable liquids such as petrol, paint, solvents and compatible oils.
Class C
Flammable gases such as propane, butane, methane and LPG.
Class D
Combustible metals such as magnesium, sodium and certain metal powders.
Class F
High-temperature cooking oils and fats used in deep-fat fryers.
Electrical Equipment
Electricity is an additional hazard rather than a formal UK fire class while equipment remains energised.
One Extinguisher Can Carry Several Fire Ratings
A foam extinguisher may carry Class A and Class B ratings. Similarly, a dry powder extinguisher may carry Class A, B and C ratings. The identification colour describes the agent, not the number of fire classes it can cover.
Why Were Older Fire Extinguishers Different Colours?
Older extinguishers were commonly manufactured with the entire cylinder painted in a colour associated with the agent. For example, older carbon dioxide extinguishers could be predominantly black, while older foam units could be cream.
Modern extinguishers are normally predominantly red, with a smaller coloured identification area showing the extinguishing medium.
Older equipment should not automatically be condemned because of its colour. However, a competent technician should confirm that it remains:
- Safe and serviceable
- Suitable for the current risk
- Clearly identifiable
- Supported by available components
- Correctly maintained
- Free from corrosion and damage
Do Not Rely on Colour When an Extinguisher Is Old or Unclear
Where labels are missing, damaged or illegible, the extinguisher should be professionally inspected. An unidentified unit should not be relied upon for emergency protection.
Why Are Modern Extinguisher Bodies Mainly Red?
Predominantly red cylinders provide consistent recognition as firefighting equipment. The identification panel then distinguishes the agent contained inside.
This arrangement provides:
- A consistent appearance for portable firefighting equipment
- A clear visual link between the extinguisher and fire-safety provision
- Agent identification through the coloured label area
- Space for operating instructions and fire-rating symbols
- Improved consistency between different manufacturers
Can You Choose an Extinguisher by Colour Alone?
No. Colour coding is only one part of extinguisher identification.
Before selecting or using an extinguisher, check:
The Extinguishing Agent
Confirm whether the unit contains water, foam, powder, carbon dioxide, wet chemical or a specialist agent.
The Fire Class
Identify the material or fuel involved in the fire.
The Fire Rating
Check the extinguisher’s certified firefighting capability.
Electrical Hazards
Determine whether equipment remains energised and whether the agent is approved for the risk.
The Instructions
Read the operating directions and safety warnings printed on the cylinder.
Your Escape Route
Only consider first-aid firefighting while maintaining a clear and safe route of escape.
BS 5306-8:2023 provides recommendations for selecting and positioning portable fire extinguishers.
Read the
BSI information for BS 5306-8:2023
.
Which Extinguisher Colours Are Commonly Found in Businesses?
| Premises | Typical Risks | Possible Extinguisher Colours |
|---|---|---|
| Office | Paper, furniture, computers and electrical equipment. | Red water-based protection and black CO₂ near significant electrical risks. |
| Commercial kitchen | Cooking oils, electrical equipment and ordinary combustible materials. | Yellow wet chemical, with suitable black CO₂ and Class A protection where required. |
| Warehouse | Packaging, stored goods, vehicles, machinery and battery charging. | A risk-specific combination based on stored goods and work processes. |
| School | Paper, furniture, laboratories, kitchens and electrical equipment. | Red water-based units, black CO₂ and specialist kitchen or laboratory protection. |
| Workshop | Timber, fuel, paint, machinery, gas cylinders and hot work. | Red, cream, blue, black or specialist units depending on the identified risks. |
| Metal-processing facility | Combustible metals, machinery and hot processes. | Signal-violet Class D protection selected for the specific metal, plus other risk-appropriate units. |
These Examples Are Not a Substitute for a Site Survey
Businesses within the same sector can have different layouts, materials and equipment. Extinguisher selection should follow a premises-specific fire risk assessment.
Do Fire Extinguisher Signs Use the Same Colours?
Extinguisher identification signs may use a coloured panel corresponding with the extinguishing medium. They can also show:
- The extinguisher type
- The suitable fire classes
- Risks on which it must not be used
- Basic operating information
- The equipment location
However, the sign should support rather than replace the label printed on the extinguisher.
Signs are particularly useful when:
- Several extinguisher types are installed together.
- The unit is positioned at a low level.
- The extinguisher is inside a cabinet.
- The equipment is not immediately obvious.
- Members of the public use the premises.
Where Should Colour-Coded Extinguishers Be Positioned?
Fire extinguishers should be visible, accessible and positioned where they can be reached safely.
General positioning principles include:
- Position general extinguishers on escape routes.
- Install equipment near exits and recognised fire points.
- Keep extinguishers free from obstruction.
- Keep operating labels facing outwards.
- Position specialist units near the relevant hazard.
- Avoid locations where a user could become trapped.
- Protect equipment from weather, impact and contamination.
- Use suitable wall brackets, stands or cabinets.
Read our complete guide to
fire extinguisher positioning
.
Should Extinguisher Colour Labels Be Checked?
Yes. The identification colour, operating instructions and fire-rating information should remain visible and legible.
Monthly Fire Extinguisher Inspection Checklist
- Confirm the extinguisher is in its designated location.
- Check that it remains visible and accessible.
- Confirm the coloured identification label is clear.
- Check that operating instructions are readable.
- Inspect the cylinder for corrosion or damage.
- Check the pressure gauge where one is fitted.
- Confirm the safety pin and tamper seal are intact.
- Inspect the hose, horn or nozzle.
- Check the wall bracket, stand or cabinet.
- Confirm the extinguisher sign remains present.
- Record and report any defect.
A missing or illegible identification label should be reported to a competent fire extinguisher technician.
How Often Should Fire Extinguishers Be Serviced?
Portable extinguishers should normally receive a professional basic service every 12 months. Routine visual inspections should also be completed between annual services.
During servicing, a competent technician may check:
- The extinguisher type and identification colour
- The suitability of the unit for the risk
- The cylinder condition
- The pressure or weight
- The hose, horn and nozzle
- The safety pin and tamper seal
- The operating instructions
- The bracket, stand and signage
- The maintenance history
- The need for extended servicing or replacement
BAFE recommends using an appropriately third-party-certificated provider and operates the SP101 scheme for portable extinguisher organisations and technicians.
Read the
BAFE fire extinguisher maintenance guidance
.
Who Is Responsible for Providing Suitable Extinguishers?
The responsible person must assess the fire risks and provide appropriate fire-safety measures.
Depending on the premises, the responsible person may be:
- An employer
- A business owner
- A landlord
- An occupier
- A building owner
- A managing agent
- Another person with control of the premises
Official guidance states that the responsible person must carry out and regularly review a fire risk assessment, maintain appropriate measures and provide staff with suitable information and training.
Read the
GOV.UK workplace fire-safety guidance
.
Fire Extinguisher Colour-Code Checklist
- Red identification normally means water.
- Cream identification means foam.
- Blue identification means general dry powder.
- Black identification means carbon dioxide.
- Yellow identification means wet chemical.
- Signal violet identifies specialist Class D powder.
- Modern extinguisher bodies are normally predominantly red.
- Colour identifies the agent rather than every approved use.
- Always check the fire-rating symbols and instructions.
- Do not use standard water on live electrical equipment.
- Do not use water on burning cooking oil.
- Do not assume blue ABC powder is suitable for metals.
- Report missing, damaged or illegible labels.
- Arrange professional servicing every 12 months.
- Select extinguishers through a competent fire-risk assessment.
Frequently Asked Questions About Fire Extinguisher Colours
What are the five main fire extinguisher colours?
The five most common identification colours are red for water, cream for foam, blue for dry powder, black for carbon dioxide and yellow for wet chemical.
What does a red fire extinguisher label mean?
A red identification label normally indicates a water or water-based extinguisher intended primarily for suitable Class A combustible materials.
What does a cream extinguisher label mean?
Cream identifies a foam extinguisher, commonly used for suitable Class A and Class B fire risks.
What does a blue extinguisher label mean?
Blue normally indicates a general dry powder extinguisher. Dry powder can create visibility, breathing and contamination hazards, particularly indoors.
What does a black extinguisher label mean?
Black identifies a carbon dioxide or CO₂ extinguisher, commonly selected for certain live electrical-equipment risks.
What does a yellow extinguisher label mean?
Yellow identifies a wet chemical extinguisher, primarily designed for Class F cooking oils and fats.
What colour is a Class D extinguisher?
Specialist Class D metal-fire powder is identified using signal violet under current UK colour-coding guidance.
Why are modern extinguishers mainly red?
Predominantly red bodies provide consistent identification as firefighting equipment. A smaller coloured panel identifies the extinguishing medium.
Can I choose an extinguisher by its colour?
Colour provides an initial indication of the extinguishing agent. However, users must also check the fire ratings, operating instructions and warnings.
Are old fully coloured extinguishers still allowed?
Some older extinguishers may remain acceptable when they are safe, serviceable, clearly identified and properly maintained. A competent technician should assess their condition and suitability.
Related Fire Extinguisher Guides
Conclusion
UK fire extinguisher colours provide a quick way to identify the extinguishing medium contained inside a portable extinguisher.
Red normally identifies water, cream identifies foam, blue identifies general dry powder, black identifies carbon dioxide and yellow identifies wet chemical. Signal violet identifies specialist Class D metal-fire powder.
Nevertheless, colour coding does not confirm every application or limitation. Two products with the same identification colour can carry different fire ratings and approvals.
Therefore, users should always check the operating instructions and fire-rating symbols. Businesses should also obtain competent advice to ensure each extinguisher is correctly selected, positioned, commissioned and maintained.
Most importantly, portable extinguishers should only be considered when the fire remains small, the correct equipment is available and the user can maintain a safe route of escape.
Professional Fire Extinguisher Services
AK Fire Safety supplies, commissions, installs and maintains fire extinguishers for businesses and organisations throughout the United Kingdom.
Our services include:
- Fire extinguisher site surveys
- Risk-appropriate extinguisher selection
- Supply and on-site commissioning
- Extinguisher stands and wall brackets
- Fire extinguisher identification signs
- Annual servicing and inspections
- Extended servicing and overhauls
- Refilling and recharging
- Replacement of damaged or obsolete units
- Responsible extinguisher disposal
- Multi-site maintenance programmes
- Nationwide service coverage
Telephone: 01604 459588
Email: sales@akfiresafety.co.uk