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What do the colours on fire extinguishers mean?
Short answer
In the UK and the rest of Europe an extinguisher is red all over, because EN 3 requires fire equipment to be red; the extinguishing agent is shown by a small coloured band or panel — cream for foam, blue for dry powder, black for carbon dioxide, yellow for wet chemical, and no band for water. In the United States there is no agent colour code at all: NFPA 10 relies on fire-class letters and pictograms, so a red American extinguisher tells you nothing about what is inside.
At a glance
Europe and UK
BS EN 3-7:2004+A1:2007 — red body, small coloured agent zone
UK agent colours
Water red · foam cream · powder blue · CO₂ black · wet chemical yellow
United States
NFPA 10 (2026 edition) — class letters and pictograms, 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
Requires portable extinguisher bodies to be red, with the extinguishing agent identified by a small coloured zone and by text and pictograms.
Colour meanings in EN 3-7
Colour
Meaning
Paired with
Red body
Fire-fighting equipment, whatever the agent inside
—
Cream zone (UK practice)
Foam
—
Blue zone (UK practice)
Dry powder
—
Black zone (UK practice)
Carbon dioxide
—
Yellow zone (UK practice)
Wet chemical
—
All red (UK practice)
Water
—
Status checked 29 September 2026. Summary only. BS EN 3-7 is sold by BSI and other CEN members. The agent colour zones listed are UK practice as reported by secondary sources; 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. Identifies suitability by fire-class letters and pictograms rather than by body colour.
Colour meanings in NFPA 10
Colour
Meaning
Paired with
No agent colour code
US extinguishers are identified by class markings and pictograms; body colour, often red, 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. 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, 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. EN 3 changed that by requiring the body to be red, in line with the rule that fire-fighting equipment is identified by red, and limiting the agent colour to a zone covering a small part of the surface. The UK kept its old colour associations for that zone, so the familiar blue, black and cream survive as bands near the top. Older all-blue or all-black units may still be found; they are not a different system, just an older generation of the same one.
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. Dry powder units, for example, are often rated for several classes; foam may be rated for solid and liquid fires but not for cooking oil; wet chemical units exist precisely because oil fires need a different agent. Water-mist units, which are newer, are usually white or red depending on the maker's reading of the rules. The consistent advice from fire authorities is to read the label, not trust the band.
The American approach
In the United States, extinguishers are commonly red but may be silver, chrome or other colours, and colour is not used to identify the agent. Instead NFPA 10 relies on the fire-class letters (A for ordinary combustibles, B for flammable liquids and gases, C for energised electrical equipment, D for combustible metals, K for cooking media) and on pictograms showing which fires a unit may and may not be used on. Older American units carried coloured geometric shapes for each class — a green triangle, a red square, a blue circle, a yellow star — and some still do alongside the pictograms. Visitors from Europe should not read a US unit's body colour as meaning anything about its contents.
Class letters differ between systems too: the European F class for cooking oils corresponds to the American K class, and the treatment of electrical fires as a class differs. The pictogram is the safer guide when crossing borders.
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
No separate zone (all red)
Never on cooking oil; check electrical rating
Foam
Cream
Cream
Check which fire classes it is rated for
Dry powder
Blue
Blue
Often multi-class; residue and visibility issues indoors
Carbon dioxide
Black
Black
Usually for electrical equipment; little cooling effect
Wet chemical
Yellow (introduced later)
Yellow
Intended for cooking-oil fires
Source: Fire extinguisher (Wikipedia); European Standards online catalogue (EN, ISO, IEC, BSI, ASTM listings). UK practice as reported in secondary sources. 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 pictograms 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.
Under BS EN 3 practice, UK extinguishers are red with a second colour band or panel identifying the agent: none for water, cream for foam, blue for dry powder, black for carbon dioxide and yellow for wet chemical.
Caveat: Summarised from a secondary source and not yet checked against the standard itself; confirm with the standard before relying on it.
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 extinguishers are marked with fire-class pictograms, and in the past with coloured geometric symbols, rather than with an agent colour code on the body.
Caveat: Summarised from a secondary source and not yet checked against the standard itself; confirm with the standard before relying on it.
European standard EN 3 requires the body to be red so that all fire equipment shares one identifying colour; the agent is shown by a smaller 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 units are identified by class letters and pictograms under NFPA 10, and the body colour, often red, does not indicate the agent.
Reviewed 29 September 2026. Colourwise summarises its sources in its own words and does not reproduce standards text or proprietary colour data. Spotted an error? Tell us.