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What do the colours on fire extinguishers mean?
Short answer
In the UK an extinguisher made to the European standard EN 3 is red, whatever is inside, and the extinguishing agent is shown by a small coloured zone — pale cream for foam, blue for powder, signal violet for the special powders used on metal fires, black for carbon dioxide, canary yellow for wet chemical, and red (no contrasting zone) for water. In the United States the fire-class letters on the label do that job, so the body colour of an American extinguisher is not a guide to what is inside.
At a glance
Europe and UK
BS EN 3-7:2004+A1:2007 — red body; UK zone colours in BS 5306-10:2019
UK agent colours
Water red · foam cream · powder blue · Class D powder violet · CO₂ black · wet chemical yellow
United States
NFPA 10 (2026 edition) — class letters on the label, no agent colour code
Rule of thumb
Read the label, not the colour
The 2 standards
EN 3-7: Portable fire extinguishers — Part 7: Characteristics, performance requirements and test methods
Issued by
CEN (published in the UK as BS EN 3-7)
Edition
2004+A1:2007 (2007)
Status
Current
Applies to
Europe, including the UK
The European standard for portable extinguishers. Units made to it are predominantly red, with the extinguishing agent identified on the instruction label and, in the UK, by a small coloured zone whose colours are set out in BS 5306-10:2019.
Colour meanings in EN 3-7
Colour
Meaning
Paired with
Red body
Fire-fighting equipment, whatever the agent inside
—
Pale cream zone (UK)
Foam
—
Blue zone (UK)
Powder
—
Signal violet zone (UK)
Class D powder, for metal fires
—
Black zone (UK)
Carbon dioxide
—
Canary yellow zone (UK)
Wet chemical
—
Red, no contrasting zone (UK)
Water
—
Status checked 29 September 2026. Summary only. BS EN 3-7 and BS 5306-10 are sold by BSI and were not read. The zone colours are those listed in London Fire Brigade's guidance note GN08 (2022), with GOV.UK's fire risk assessment guide in agreement on red, cream, blue and black; read the label, not the colour, before use.
NFPA 10: Standard for Portable Fire Extinguishers
Issued by
National Fire Protection Association
Edition
2026 edition (2026)
Status
Current
Applies to
United States (as adopted by local jurisdictions)
Selection, installation and maintenance of portable extinguishers. In US practice suitability is shown by the fire-class letters on the label rather than by body colour.
Colour meanings in NFPA 10
Colour
Meaning
Paired with
No agent colour code
US extinguishers are identified by the fire-class letters on the label (A, B, C, D, K); body colour does not tell you the agent
—
Status checked 29 September 2026. NFPA publishes a free read-only view of its codes; the full text is sold and was not read. The edition is from NFPA's own page and the description of US practice from OSHA's published guidance. Summary only, not fire-safety advice.
Summarised in Colourwise’s own words; not the text of any standard and not compliance advice. Always work from the current edition obtained from the issuing body.
From whole-body colours to a red body with a patch
Before European harmonisation, most British extinguishers were painted all over in the agent's colour: a blue extinguisher was powder, a black one carbon dioxide, a cream one foam. Units made to BS EN 3-7 are instead predominantly red, in line with the rule that fire-fighting equipment is identified by red, with the agent colour confined to a small zone above or within the instructions; London Fire Brigade's guidance gives the limit as 5 per cent of the body surface. The UK kept its old colour associations for that zone, so the familiar blue, black and cream survive. The zone colours now sit in BS 5306-10:2019, which replaced BS 7863:2009 and made one change: the powders for metal fires moved from blue to signal violet. Older single-colour units remain acceptable until they are no longer serviceable, though official guidance is not to mix old and new styles on one floor, and some organisations still use silver or grey bodies with the colour zone.
Why the band is only a hint
The band exists to help someone pick the right unit from a row in a hurry, but it cannot carry the full message. It does not say which classes of fire the unit is rated for, whether it is safe near live electrical equipment, or how large a fire it can tackle. Those facts are on the label as pictograms and text. Powder units, for example, are often rated for several classes; foam may be rated for solid and liquid fires but is not suitable for deep-fat fryers; wet chemical units exist precisely because cooking-oil fires need a different agent. Green, which marked the old vaporising-liquid units, is still listed for clean agents and may be met in a few applications. The rating that decides whether a unit suits a fire is printed on its instruction label, so the label, not the band, is what to read.
The American approach
In the United States colour is not used as a code for the agent. OSHA's guidance describes an extinguisher by the fire-class letters on its label: A for ordinary combustibles such as paper, wood and cloth, B for flammable liquids, C for energised electrical equipment, D for combustible metals and K for cooking oils and fats. The same guidance mentions that pressurised-water units are typically large silver containers and multi-purpose dry-chemical units red, which is a description of common products rather than a rule, and the label remains the identification. Visitors from Europe should not read a US unit's body colour as meaning anything about its contents, and should not expect a coloured zone.
Class letters differ between systems too. The European class F for cooking oils and fats is the American class K, and the letter C means fires involving gases in the UK but energised electrical equipment in the United States. Read what the label says the unit is for, not just the letter.
What colour cannot do in an emergency
Colour coding works best when people have been trained on it and the lighting is good. In smoke, under emergency lighting or in low-colour-rendering light, a cream band and a red body can be hard to tell apart, and roughly one man in twelve of northern European descent has a red–green colour-vision deficiency that makes some pairs harder to separate. The layout of a fire point — one type per hazard, with a sign saying what it is for — does more than the band. This page explains the colour conventions only; choosing, siting and maintaining extinguishers is a job for a competent fire-safety professional.
The data
UK extinguisher identification colours before and after EN 3
Agent
Pre-EN 3 body colour (UK)
Current: red body with zone in
Where the label, not the colour, matters most
Water
Red
Red (no contrasting zone)
Not for live electrical equipment or cooking oil
Foam
Cream
Pale cream
Not suitable for deep-fat fryers
Powder
Blue
Blue
Often multi-class; little cooling, and loss of visibility in enclosed spaces
Powder for metal fires (Class D)
Not confirmed
Signal violet (blue before BS 5306-10:2019)
Specialist units; seek specialist advice
Carbon dioxide
Black
Black
Suited to fires in electrical equipment; disconnect the power if possible
Wet chemical
Not confirmed
Canary yellow
Intended for cooking-oil fires
Source: Fire Safety Guidance Note GN08: Hand Held Portable Firefighting Equipment (Rev 19, 9 September 2022); Fire safety risk assessment: offices and shops. Current zone colours from London Fire Brigade guidance note GN08 (2022); older body colours from GOV.UK's fire risk assessment guide. Suitability notes are general descriptions, not fire-safety advice; the unit's label governs.
How to check it yourself
Read the label: agent name, fire-class ratings and any electrical rating.
Use the colour band only to find the right type in a row of units.
Outside Europe, do not infer the agent from the body colour at all.
For older all-over coloured units, check the service label date and ask a competent person whether they are still in service.
What the evidence says
Each statement is labelled by kind — established fact, a standard’s requirement, observed market data, a convention, or Colourwise’s own interpretation or analysis — with the strength of the evidence behind it.
FactModerate evidence
The current European standard for portable fire extinguisher characteristics and performance, published in the UK as BS EN 3-7, is the 2004 edition incorporating Amendment 1 of 2007.
UK extinguishers have a signal-red body whatever they contain, with a zone of up to 5 per cent of the body surface identifying the agent: red for water, pale cream for foam, blue for powder, signal violet for Class D powder, black for carbon dioxide and canary yellow for wet chemical.
Caveat: As set out in London Fire Brigade's guidance note GN08 (2022); GOV.UK's fire risk assessment guide agrees on red, cream, blue and black. BS EN 3-7 and BS 5306-10 themselves were not read.
BS 5306-10:2019 replaced the withdrawn BS 7863:2009 as the UK code for extinguisher colour zones and changed the colour for Class D powder, used on metal fires, from blue to signal violet, leaving the other colours as they were.
Caveat: Reported by BAFE, relaying Fire Industry Association guidance; London Fire Brigade's 2022 note lists signal violet for Class D powder. BSI's own catalogue record was not checked.
The GB safety-signs regulations make red the identifying colour for fire-fighting equipment and require the red area to be large enough for the equipment to be identified easily.
US guidance identifies a portable extinguisher by the fire-class letters on its label — A, B, C, D and K — and describes no colour code for the extinguishing agent.
Caveat: From OSHA's published guidance; NFPA 10 itself was not read, so its marking system (including any pictograms) is not described here.
Extinguishers made to the European standard BS EN 3-7 are predominantly red so that all fire equipment shares one identifying colour; the agent is shown by a small coloured zone. The old UK whole-body colours survive as those zones.
What does a black band on an extinguisher mean?
In UK practice, a black band or panel marks a carbon dioxide extinguisher. Check the label for which fire classes and electrical ratings apply to that unit.
Do American fire extinguishers use colour bands?
No. US guidance identifies a unit by the fire-class letters on its label. Water units are often silver and dry-chemical units red, but that is product habit, not a code, and there is no coloured zone to read.
Reviewed 1 October 2026. Colourwise summarises its sources in its own words and does not reproduce standards text or proprietary colour data. Spotted an error? Tell us.