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To prevent cross-contamination, follow Food Standards Agency controls: separate raw and ready-to-eat foods, use dedicated boards and utensils, wash hands between tasks, store raw meat sealed below ready-to-eat food, and clean and disinfect food-contact surfaces. Manage allergen cross-contact through segregation, accurate recipes, clean equipment and clear communication.
Last updated: June 2026
Author: Global Safety Academy Editorial Team
Technically reviewed by: Global Safety Academy Food Safety Quality Review Team
Professional limitation: This article provides general food-safety information rather than legal advice. Every food business should base its controls on a documented food safety management system appropriate to its premises, menu, processes and jurisdiction.
Key facts
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Keep raw and ready-to-eat food physically separate wherever possible.
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Store raw meat, poultry and fish covered and below ready-to-eat food.
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Use dedicated equipment for high-risk preparation tasks.
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Wash hands after handling raw food and before touching ready-to-eat food.
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Clean and disinfect shared surfaces between incompatible tasks.
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Treat allergen cross-contact separately from microbiological contamination.
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Colour-coded equipment is useful industry practice, but specific colours are not prescribed by UK law.
What Is Cross-Contamination in Food Safety?
Key takeaway: Cross-contamination occurs when harmful bacteria, allergens or foreign materials are transferred to food through hands, equipment, surfaces, other foods or the surrounding environment.
Cross-contamination can happen through direct food-to-food contact or indirectly through a knife, chopping board, cloth, container, hand, glove, refrigerator shelf or preparation surface.
The highest concern is often contamination of ready-to-eat food. Unlike raw food intended for thorough cooking, ready-to-eat food may receive no later heat treatment capable of reducing harmful bacteria.
Regulation (EC) No 852/2004 requires food to be protected against contamination at every relevant stage of production, processing and distribution. Its hygiene requirements also address the design, cleaning and use of food premises, equipment, storage areas and handling processes.
Three practical types of cross-contamination
In catering training, cross-contamination can be grouped into three useful operational categories:
|
Type |
What is transferred? |
Example |
|
Microbiological cross-contamination |
Harmful bacteria, viruses or other microorganisms |
Raw-chicken juices transfer from a board to salad ingredients |
|
Allergen cross-contact |
Proteins from an allergenic ingredient |
A knife used for peanut butter is reused for an allergy order |
|
Physical contamination transfer |
Foreign objects or fragments |
Broken packaging, hair or a damaged utensil contaminates prepared food |
Chemical contamination is also a major food-safety hazard, but it is normally managed as a separate hazard category. Examples include cleaning chemicals, pesticides or unsuitable containers contaminating food.
The 4 Cs of food safety place cross-contamination alongside cooking, chilling and cleaning as a core catering control.
Separating Raw and Ready-to-Eat Foods
Key takeaway: Physical separation is the strongest routine control because it removes opportunities for raw-food contamination to reach food that will not be cooked again.
The Food Standards Agency advises food businesses to keep raw foods covered and separate from ready-to-eat foods. Work areas, surfaces and equipment used for each category must be adequately separated.
Use separate preparation areas where possible
A well-designed commercial kitchen should create a clear workflow from contaminated or raw activities towards clean and ready-to-eat activities.
Controls may include:
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A dedicated raw-meat preparation area
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A separate ready-to-eat preparation station
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Dedicated sinks where the risk assessment requires them
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Separate storage containers
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Dedicated knives, boards, tongs and trays
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Clear labels and shelf locations
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Barriers or sufficient physical distance
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Different staff or task periods where practical
Preparation should not move backwards and forwards between raw and ready-to-eat work without an effective changeover procedure.
Separation by time
Smaller kitchens may not have enough space for permanently separate work areas. Codex food-hygiene principles recognise that separation can sometimes be achieved by time, provided effective cleaning and, where appropriate, disinfection take place between tasks.
A time-separated process may involve:
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Removing ready-to-eat ingredients from the area.
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Preparing raw meat using designated equipment.
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Moving the raw food into protected storage or cooking.
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Removing waste and food debris.
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Cleaning and disinfecting the work area.
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Washing hands and changing contaminated protective clothing.
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Bringing ready-to-eat ingredients into the cleaned area.
Time separation should be documented, supervised and realistic during busy service. A written procedure that staff cannot follow under operational pressure is not an effective control.
Do not wash raw chicken
Washing raw chicken, meat or poultry can spread contaminated droplets onto sinks, taps, worktops, clothing and nearby food. Thorough cooking—not rinsing—is the appropriate bacterial control.
Worked example: preparing chicken salad
A kitchen prepares raw chicken portions and ready-to-eat salad at the same time. One chef cuts the chicken, touches a refrigerator handle and then reaches for a salad container without washing their hands.
Even though the salad never touches the raw chicken directly, the refrigerator handle and the chef’s hands create an indirect contamination route.
A safer process uses separate stations, dedicated utensils, immediate handwashing after raw handling and routine disinfection of shared touch points.
Colour-Coded Chopping Boards and Equipment
Key takeaway: Colour coding makes dedicated equipment easier to identify, but separation, correct use and effective cleaning remain the actual safety controls.
Colour-coded chopping boards are widely used in UK catering. However, UK food law does not prescribe one compulsory set of board colours.
Businesses should establish a clear system, train staff and display the chosen chart where equipment is stored. The same colour must mean the same thing throughout the premises.
A common industry convention is:
|
Colour |
Commonly allocated use |
|
Red |
Raw meat |
|
Yellow |
Cooked meat |
|
Blue |
Raw fish and seafood |
|
Green |
Washed fruit, salad and ready-to-eat vegetables |
|
Brown |
Unwashed vegetables and root vegetables |
|
White |
Bakery products and dairy foods |
Some organisations introduce additional colours, such as purple, for controlled allergen-sensitive preparation. There is no universal legal meaning for an additional colour, so staff must follow the business’s documented system.
Colour alone is insufficient. Boards should also be:
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Clearly labelled where necessary
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Stored separately
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Maintained in good condition
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Cleaned and disinfected after use
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Replaced when heavily scored, cracked or damaged
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Used with corresponding dedicated utensils where appropriate
A red board does not make raw-meat preparation safe when the same knife, cloth or hands are then used for salad.
Safe Fridge Storage Order
Key takeaway: Raw meat, poultry and fish should be contained and stored below ready-to-eat food so leaks cannot drip onto food that will be served without further cooking.
Using separate refrigeration for raw and ready-to-eat foods is the preferred control where premises, volume and risk justify it.
Where one refrigerator must be shared, organise it to prevent direct contact, leakage and dripping.
Practical fridge arrangement
|
Fridge area |
Suitable contents |
|
Upper shelves |
Covered cooked foods, desserts and ready-to-eat meals |
|
Middle shelves |
Protected dairy products, prepared ingredients and washed produce |
|
Lower shelves |
Raw meat, poultry and fish in sealed, leakproof containers |
|
Dedicated segregated area |
Clearly labelled allergenic ingredients where separation is required |
|
Drawers or designated containers |
Unwashed produce, separated from ready-to-eat foods |
Raw food must not be left in open trays or unstable packaging. Place deliveries into suitable food-grade containers when original packaging does not provide reliable containment.
Other refrigerator controls include:
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Covering or sealing every prepared food
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Labelling food clearly
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Keeping allergenic ingredients identifiable
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Cleaning spills immediately
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Avoiding overloading
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Removing damaged containers
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Following use-by dates
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Keeping food within the appropriate chilled-temperature limits
For detailed refrigeration limits, see the food safety temperatures guide.
Hands, Cloths and Surfaces
Key takeaway: Hands, cleaning cloths and frequently touched surfaces can move contamination around a kitchen even when raw and ready-to-eat food appear separated.
Wash hands between incompatible tasks
Food handlers should wash their hands thoroughly:
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Before starting food preparation
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Before handling ready-to-eat food
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After touching raw meat, poultry, fish or eggs
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After handling unwashed produce
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After touching bins or waste
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After cleaning
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After using the toilet
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After touching the face, hair, phone or personal belongings
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After removing disposable gloves
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Whenever contamination may have occurred
Disposable gloves do not replace handwashing. Gloves can become contaminated in exactly the same way as bare hands and may spread contamination when staff touch handles, equipment or ready-to-eat ingredients.
Control cloths and cleaning equipment
A reusable cloth can quickly spread contamination between worktops, equipment and hand-contact points.
Safer controls include:
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Using disposable cloths for high-risk tasks
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Allocating reusable cloths to defined areas
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Using a clear colour-coding system
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Replacing contaminated cloths immediately
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Laundering reusable cloths at an effective temperature
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Keeping wiping cloths away from food
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Never using the same cloth for floors and food-contact surfaces
Colour-coded cloths are helpful only when staff understand and consistently follow the system.
Clean and disinfect between tasks
Cleaning removes grease, food debris and dirt. Disinfection reduces harmful microorganisms to an acceptable level. Where both are required, clean first and then apply a suitable disinfectant for its specified contact time.
Priority surfaces include:
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Chopping boards
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Knives and utensils
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Preparation tables
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Slicers and mixers
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Refrigerator handles
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Taps and sink controls
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Thermometer probes
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Container lids
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Reusable menus or order devices used in preparation areas
For the complete process, see cleaning and disinfection in a commercial kitchen.
Preventing Allergen Cross-Contact
Key takeaway: An allergy order is safe only when the ingredients, recipe, equipment, preparation area and communication process have all been checked.
Allergen cross-contact occurs when an allergenic protein is transferred unintentionally to food that is not intended to contain it. Very small quantities can be significant for some allergic consumers.
The Food Information Regulations 2014 and Regulation (EU) No 1169/2011 establish allergen-information requirements. Effective kitchen controls support accurate information and help prevent unintended allergen presence.
Practical allergen controls
Food businesses should:
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Maintain accurate ingredient and recipe information
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Check labels whenever products or suppliers change
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Identify likely cross-contact points
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Store allergenic ingredients in closed, labelled containers
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Use thoroughly cleaned or dedicated equipment
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Wash hands and change gloves before preparing an allergy order
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Prepare the order in a clean area
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Use fresh ingredients from protected containers
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Prevent shared oils, water or cooking equipment from transferring allergens
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Communicate the allergy requirement clearly from order-taking to service
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Never guess whether a product or dish contains an allergen
Removing visible nuts, cheese or another ingredient from a completed dish does not make it safe. The allergenic protein may already have transferred to the food, sauce, equipment or garnish.
Dedicated equipment does not remove every risk
A dedicated board and knife are useful only when they have been stored safely and the surrounding preparation process is controlled.
An “allergen-free” claim should not be made casually. Businesses must assess ingredients, suppliers, storage, preparation, cooking and service before making statements about allergen absence.
For fuller guidance, see [Internal link: preventing allergen cross-contact — planned Allergen Awareness pillar].
Cross-Contamination Prevention Checklist
Key takeaway: Managers should verify that separation controls work during real service conditions rather than relying only on written procedures.
Use this checklist during opening checks, supervision and internal reviews:
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Raw and ready-to-eat preparation areas are clearly separated.
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Dedicated boards, knives and utensils are available.
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Staff understand the site’s colour-coding system.
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Raw food is covered and stored below ready-to-eat food.
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Food containers are intact, labelled and leakproof.
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Staff wash hands between raw and ready-to-eat tasks.
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Gloves are changed at appropriate points.
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Cloths and cleaning equipment are allocated correctly.
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Shared surfaces are cleaned and disinfected between tasks.
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High-touch points are included in the cleaning schedule.
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Allergen ingredients are identified and controlled.
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Allergy orders follow a defined communication process.
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Damaged chopping boards and utensils are replaced.
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Managers record and correct repeated failures.
Cross-contamination prevention should form part of the organisation’s HACCP-based food safety management procedures and staff training.
Strengthen Food-Safety Practice Across Your Team
Key takeaway: Training helps food handlers understand why separation controls matter and how to apply them consistently during busy catering work.
Cross-contamination controls fail when staff know the rules but cannot apply them during deliveries, preparation, cooking, service and cleaning.
The Level 2 Food Safety & Hygiene (Catering) course supports food handlers in developing practical knowledge of contamination prevention, temperature control, personal hygiene, cleaning and safe food handling.
For allergen-specific responsibilities and cross-contact controls, see GSA’s Allergen Awareness training pathway.
Sources and Methodology
Key takeaway: This article distinguishes legal hygiene duties from guidance and voluntary industry practices such as specific board-colour conventions.
The article was checked against primary legislation and official guidance available in June 2026:
International food businesses should map these principles to local legislation, regulator guidance and approved food-safety procedures. Chopping-board colours and terminology may differ between countries and organisations.
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