Colour coding is two questions, not one
Area zones ask where you are, surface classes ask what you are touching, and most published schemes mix the two without saying so.
- Axes
- Area and surface
- Area zones
- Nine in our model
- Surface classes
- Three
- Worked schemes
- Four, as examples
- Colours
- Yours
A colour-coded scheme answers one of two questions: which area am I in, or which surface am I touching. Both are valid, and each has a blind spot the other covers. Hygienix records the scheme you already run, publishes worked examples rather than rules, and specifies a second control where your scheme needs one.
- 01 Enquiry
- 02 Zone survey
- 03 Zone plan
- 04 Supply
- 05 At the position
- 06 Verify
- 07 Review
Colour coding is two questions, not one sits at step 3 of from survey to supply. You receive the written zone plan.
Most schemes answer half the question
Red for high risk and blue for food contact are not two rules in one scheme. They are two different schemes.
Look at almost any published colour-coding chart and you will find both in the same paragraph. Red high risk, yellow low risk: that is an area scheme. Blue food contact, black floors: that is a surface scheme. Nobody points out that they answer different questions, so sites adopt half of each and end up with gaps they cannot see.
The gap is real. A site that codes by area has a red brush for the high-risk room, and nothing stops that brush going from the floor to the table inside it. A site that codes by surface has a blue brush for every food-contact surface in the building, and nothing stops it crossing the high-risk boundary. Each scheme has one blind spot, and it is a different one.
So the first question in a survey is which question your scheme answers. Then we say what the second control has to be: a shadow board position, a stripe, a physical barrier at the boundary, or a second colour.
The two axes, written out
Nine area zones and three surface classes. The codes are ours. The colours are whatever your scheme gives them.
| Code and name | What it covers | Axis |
|---|---|---|
| HR High risk | A segregated area for ready-to-eat product past its kill step. Separate entry, separate tools, and the tools never leave. | Area |
| HC High care | A controlled area for vulnerable product, with less segregation than high risk. | Area |
| LR Low risk | Production before the kill step, or where product is fully enclosed. | Area |
| AL Allergen-controlled | An area, a line or a changeover window where an allergen is handled. It overlays any of the zones above. | Area |
| WS Warehouse and dry store | Raw materials, packaging and finished goods storage. | Area |
| WR Washroom and welfare | Toilets, changing rooms, canteen, lockers and prayer rooms. | Area |
| EN Engineering and chemical store | Workshop, chemical store and plant rooms. | Area |
| LA Laboratory and QC | Sampling and testing. | Area |
| EX External | Yard, loading bay, bin area and drains outside the building line. | Area |
| FC Food contact | Anything the product touches: belts, tables, blades, utensils, tanks and crates. | Surface |
| NF Non-food contact | Equipment exteriors, frames, guards, walls, doors and control panels. | Surface |
| DR Floors and drains | Floors, gullies, drain covers, plinths and wheel paths. Always the dirtiest tag on the board. | Surface |
For the wall, the board and the file
The colour scheme decision record
Which question the scheme answers, which colours, and why. It is section six of your zone plan.
The second control for each zone
Where your scheme leaves a gap, the control that closes it: a board position, a stripe, a barrier or a second colour.
The migration plan
Dated, zone by zone, if anything in the scheme changes.
Zone posters
Readable from three metres, each with the colour, the zone name in words, and what must never enter.
A colour key card for each crew room
The whole scheme on one card, with every colour named beside its zone.
Changing a scheme is a risk in itself
A scheme your crew has followed for years is a control that works. Ripping it out overnight creates a week where nobody is sure which brush goes where. So when a scheme does need to change, the plan gives a migration path with dates.
- 01
New items arrive first
The colour-coded items the plan specifies are delivered and stored before the switch date, so nothing is short on the morning.
- 02
The toolbox talk
The crew hears the change on the morning of the switch, with the new poster in front of them.
- 03
Old items leave the same shift
The old colours are withdrawn in the shift that switches, so two schemes never share a board.
- 04
Posters and cards change together
The wall posters and colour key cards change the same day, so nothing on the wall contradicts the board.
Three canteens, one scheme
A catering contractor runs three staff canteens on one industrial site in Jubail. Each canteen was set up by a different supervisor, and each uses different colours. Crew members rotate between canteens every few weeks.
The survey asks which scheme most of the crew already follows. The answer is the one in the largest canteen, so the plan makes that the site scheme, as a surface-led four-colour scheme like scheme B below.
The two smaller canteens get a migration date each, two weeks apart. New cloths, brushes and trigger bottles in the site colours are delivered before each date. The toolbox talk happens on the morning of the switch, the old items leave in the same shift, and the wall posters change the same day.
The contractor holds a colour scheme decision record, a dated migration plan for each canteen, the poster set, and a colour key card for each crew room.
Four schemes that work, as examples
These are worked examples, not rules. If your crew already follows a scheme without thinking, the right answer is almost always to keep it and write it down properly.
Area-led, five colours
For a zoned food manufacturer. A tool in the wrong area is visible across the room. Inside a zone, nothing stops a floor tool reaching a table, so scheme A needs a second control in each zone, usually a shadow board position or a stripe on the floor tools.
- Red for high risk
- Green for high care
- Yellow for low risk
- Purple for allergen
- Black for external and waste
Surface-led, four colours
For catering, quick-service and retail kitchens. It is quick to teach and holds on a one-area site. It says nothing about crossing a zone line.
- Blue for food contact
- Green for non-food contact
- Black for floors and drains
- Red for the washroom
Hybrid, eight colours
For a mid-size plant with real boundaries. It answers both questions. Eight colours is a real training load, and the scheme needs wall posters and shadow boards to hold.
- Red for high risk
- White for high care
- Blue for low-risk food contact
- Green for low-risk non-food contact
- Black for floors
- Purple for allergen
- Yellow for the washroom
- Orange for external
Minimum, four colours
For a small kitchen, a clinic or a school. It is the smallest scheme that still controls the main cross-contamination route, and the right place to start for a site with no scheme at all. It has no allergen separation and no zone boundary.
- Blue for food contact
- Green for general surfaces
- Yellow for floors
- Red for the washroom
What QA leads ask about colours
Do we have to change our colours to buy from you?
No. There is no fixed set of hygiene colours every site must use. The right scheme is usually the one your crew already follows, and the plan records it with the reason.
What if our scheme is genuinely broken?
The findings list says so, with the problem named. The usual one is the same colour in a high-risk area and on a drain. You get a migration path with dates, and the decision stays yours.
Which colour should food contact be?
Whichever colour your scheme gives it. Blue is common because little food is blue, but it is a convention, not a rule.
How many colours can a crew hold?
We design to eight at most for a plant with posters and shadow boards, because every extra colour is one more thing a crew has to remember. If you need more than eight distinctions, the answer is usually a physical control at a boundary rather than another colour.
What about crew who cannot tell the colours apart?
Colour vision deficiency is common in men, and red against green is the hardest pair to tell apart. So every zone label carries three cues: the colour, the zone name in words, and the tool's position on the shadow board. The configurator warns on a red and green pairing rather than blocking it, because plenty of sites have inherited one.
Should allergen tools have their own colour?
Where an allergen is handled on a line or in a changeover window, usually yes, with storage inside the allergen area so the tools cannot leave it.
Put a scheme to work
The zone configurator
Pick an axis, keep your colours, and print the poster and the shadow board.
Read moreThe equipment lineZONE
Colour-coded cloths, and the zone kit your plan lists around them.
Read moreSection 06The zone plan
Where your colour decision is written down, as section six.
Read moreHow you startThe zone survey
The walk where your existing colours get recorded first.
Read moreITF TrainingFood safety for food handlers
The ITF Training course that gives a new crew member the hygiene basics a scheme depends on.
Read moreITF ConsultHACCP with ITF Consult
The hazard analysis that decides which areas are high risk.
Read morePart of one system
Every division keeps records to the same standard, so the second one you need works the way the first one did.
Write down the scheme you already run
Start in the configurator with the colours your crew already uses, or book a zone survey and we record them on the walk.