How to prevent cross-contamination during food prep: colour-coded boards and knives, prep sequencing and timing, glove changes and wash-downs between tasks.
Prevent cross-contamination during prep by separating raw and ready-to-eat foods in time and space: use dedicated colour-coded boards and knives, sequence tasks from lowest to highest risk, wash and sanitise surfaces and equipment between tasks, and change gloves and wash hands whenever you switch jobs. A planned prep workflow stops harmful bacteria and allergens moving from raw meat, dirty produce or hands onto foods that will not be cooked again. Key takeaways: Separate raw and ready-to-eat foods by both space (different boards, knives and areas) and time (prep ready-to-eat first, raw last).. Colour-coded boards and knives make separation visible and easy to audit, but they only work if staff are trained and the colours are consistent.. Clean AND sanitise surfaces, utensils and hands between tasks; a quick wipe is not enough to remove bacteria or allergens.. Gloves are not a substitute for handwashing; change them every time you switch tasks and wash hands before putting on a fresh pair.. Allergen cross-contact is a form of cross-contamination, so the same separation, sequencing and wash-down rules apply.. Common colour-coded board convention: Colour, Typical use. Red — Raw meat. Blue — Raw fish and seafood. Yellow — Raw poultry. Green — Fruit, vegetables and salad. Brown — Cooked meats. White — Bakery and dairy. What cross-contamination is and why prep is the danger zone Cross-contamination is the transfer of harmful bacteria, viruses or allergens from one food, surface, piece of equipment or person to another. During preparation it usually moves in one of three ways: directly from a raw food touching a ready-to-eat food, indirectly via a shared board, knife, container or cloth, or by hand and clothing contact. Prep is high risk because raw meat, poultry, seafood, eggs and unwashed produce are handled in the same space and time window as salads, cooked meats, sandwiches and garnishes that will not be cooked again to kill pathogens. Under the Food Standards Code, businesses must take all practicable measures to prevent the contamination of food, and separating raw from ready-to-eat is a core part of that duty. Getting prep workflow right is often more effective than any single control because it removes the opportunity for transfer before it happens. Direct contact: raw chicken juices dripping onto a plated salad below it.. Indirect contact: slicing cooked ham on the board just used for raw beef.. Hand and cloth contact: handling raw prawns then buttering bread without washing.. Allergen cross-contact: a scoop moving flour into a gluten-free dish.. Separate in space: dedicated boards, knives and zones The simplest way to stop transfer is to physically separate raw and ready-to-eat work. Give raw proteins their own boards, knives, tongs and containers, and keep separate equipment for ready-to-eat foods. Many Australian kitchens use a colour-coded system so the separation is visible at a glance and easy to check during a supervisor walk-through. Colours are a convention, not a legal standard, so confirm your own scheme and train every staff member on it, including casuals and agency staff. If you do not use colours, achieve the same outcome by labelling equipment and dedicating specific boards to specific tasks. Store raw foods below and away from ready-to-eat foods in fridges and on benches so nothing can drip down. Set up distinct bench zones where possible, and never let raw and ready-to-eat foods share a chopping surface without a full clean and sanitise in between. Red: raw meat. Blue: raw fish and seafood. Yellow: raw poultry.. Green: fruit and vegetables/salad. Brown: cooked meats. White: bakery and dairy.. Treat colours as a widely used convention; standardise and train, and confirm the scheme that suits your menu.. Replace boards that are deeply scored or cracked, as grooves harbour bacteria that sanitising cannot reach.. Separate in time: sequence and schedule your prep When separate benches or equipment are not available, separate the work in time instead. Sequence tasks so ready-to-eat and lower-risk foods are prepared first, while surfaces and hands are clean, and higher-risk raw foods are handled last. That way the day's raw handling does not sit upstream of foods that will not be cooked again. Between changes of task, stop and reset the workstation with a full clean and sanitise. Batch similar tasks together to cut the number of transitions, but never let convenience collapse the separation between raw and ready-to-eat. Keep an eye on time and temperature at the same time: use the 2-hour/4-hour rule so potentially hazardous food is not left in the 5 C to 60 C danger zone longer than is safe, and return ingredients to refrigeration promptly when a prep step is finished. Prep salads, sandwiches, garnishes and cooked-meat items early, before any raw handling.. Handle raw poultry, meat and seafood in a dedicated later block, then clean down thoroughly.. Reset the bench with a clean and sanitise every time you switch between raw and ready-to-eat.. Apply the 2-hour/4-hour rule and keep cold food at or below 5 C and hot food at or above 60 C.. Wash-downs between tasks: clean then sanitise Cleaning and sanitising are two separate steps. Cleaning with warm water and detergent removes visible food, grease and dirt, which also removes the bulk of bacteria and allergen residue. Sanitising then reduces any remaining bacteria to a safe level, using either heat (very hot water, typically a commercial dishwasher or a sanitising rinse) or a food-safe chemical sanitiser used strictly to the manufacturer's dilution and contact-time instructions. Sanitiser applied to a dirty surface will not work, so you must clean first. Do a full clean and sanitise on boards, knives, benches and equipment whenever you move from one food type to another, especially after handling raw protein. Change or launder cloths frequently and keep separate cloths for cleaning versus wiping food-contact surfaces, because a reused wet cloth is one of the most common ways bacteria spread around a kitchen. Step 1 clean: remove debris, then wash with hot water and detergent.. Step 2 sanitise: apply heat or a food-safe chemical sanitiser at the correct concentration and contact time.. Rinse or air-dry as the sanitiser instructions require; do not wipe sanitiser off with a dirty cloth.. Use single-use paper or colour-coded cloths, and never wipe a raw-meat board then a salad board with the same cloth.. Hands and gloves: change them at every task switch Hands are a major vehicle for cross-contamination, and gloves do not change that. Gloves become contaminated exactly like bare hands, so wearing them for too long or across different tasks simply moves bacteria around while giving a false sense of security. Wash hands thoroughly with soap and warm running water and dry them on single-use towel before starting food handling, after handling raw food, after touching your face, hair, phone or rubbish, and after any break. If you use gloves, wash your hands before putting on a fresh pair and change gloves whenever you change tasks, when they tear, and at least as often as you would wash bare hands. Never handle ready-to-eat food with the same gloves used for raw meat. Where practical, use utensils, tongs or deli tissue instead of direct hand contact with ready-to-eat food. Wash hands before food handling, between raw and ready-to-eat tasks, and after breaks or touching non-food surfaces.. Treat a change of gloves as a change of hands: wash first, then glove up.. Discard gloves when torn, soiled or when switching tasks; do not wash and reuse them.. Keep long hair tied back, cover cuts with a coloured waterproof dressing, and keep fingernails short and clean.. Allergen cross-contact during prep Allergen cross-contact is cross-contamination with the food allergens that must be declared under Australian labelling rules, and even trace amounts can cause a serious reaction. The same separation, sequencing and wash-down controls apply, with extra care because you cannot see or smell an allergen. Where you can, prepare allergen-free or specific-allergen meals first, using freshly cleaned equipment and clean hands, before the allergen is introduced to the workspace. Keep dedicated, clearly labelled utensils and containers for high-risk items, avoid shared scoops between ingredients, and store allergen-containing ingredients so they cannot spill onto other foods. Cleaning is the key control for allergens because there is no cooking step that removes them; a thorough wash with detergent physically removes residue in a way that wiping alone does not. Communicate clearly between front and back of house so a customer allergen request is handled the same way every time. Confirm the ingredients in a dish before answering an allergen question; check labels, do not guess.. Prepare the allergen-free order first on freshly cleaned surfaces with clean equipment.. Use dedicated scoops and containers, and never return an unused portion to a shared container.. Physically clean equipment between allergen and non-allergen tasks; wiping alone is not enough.. Build it into a repeatable system One-off good intentions do not prevent cross-contamination; a documented, trained and monitored system does. Write your prep workflow into your food safety program or standard operating procedures, including the board colour scheme, the prep sequence, the cleaning and sanitising schedule, and the glove and handwashing rules. Train every staff member, including new starters and casuals, and refresh the training regularly. Your food safety supervisor should monitor practice on the floor, correct slips on the spot, and keep records where your program requires them. Requirements for food safety programs, supervisors and record-keeping vary by state, territory and food-business classification, so confirm what applies to you with your state or territory regulator and local council. A simple daily checklist at each prep station turns these rules into habits that hold up during a busy service and during an inspection. Document the workflow, colour scheme, sequence and cleaning schedule in your SOPs or food safety program.. Induct and regularly refresh all staff, including casual and agency workers.. Have the food safety supervisor monitor, coach and record as required.. Confirm program, supervisor and record-keeping obligations with your regulator and council.. Checklist: Separate boards, knives and containers are used for raw and ready-to-eat foods.. Ready-to-eat and lower-risk foods are prepped before raw proteins.. Surfaces and equipment are cleaned AND sanitised between task changes.. Raw foods are stored below and away from ready-to-eat foods.. Hands are washed at every task switch and gloves changed, not reused.. Cloths are single-use or colour-coded, and not shared between raw and ready-to-eat.. Cold food is kept at or below 5 C and the 2-hour/4-hour rule is applied.. Allergen-free orders are prepped first on freshly cleaned equipment.. The workflow is documented and all staff are trained on it.. Common mistakes: Using the same board or knife for raw meat and ready-to-eat food without a full clean and sanitise in between.. Wiping a surface with a dirty cloth and calling it sanitised, so bacteria and allergens are just spread around.. Wearing the same gloves across multiple tasks and treating them as a replacement for handwashing.. Storing raw meat above salads or cooked food so juices can drip down.. Leaving potentially hazardous food out during a long prep session and breaching the 2-hour/4-hour rule.. Assuming an allergen-free dish is safe when it was prepared on shared, uncleaned equipment..
A cross-contamination-safe prep routine
Sanitise the bench, lay out the correct colour-coded boards, knives and containers for the tasks ahead, and confirm boards are intact and not deeply scored. Wash your hands and put on a clean apron before you touch any food.
While the station is clean, prepare salads, sandwiches, cooked-meat items, garnishes and washed produce. Return anything you are not using straight to refrigeration to respect the danger zone and the 2-hour/4-hour rule.
When you move to raw proteins, first clear debris, wash surfaces and equipment with hot water and detergent, then sanitise. Wash your hands and put on fresh gloves if you use them.
Use the raw-designated boards and knives, keep raw foods below and away from anything ready-to-eat, and never plate a finished dish onto a surface that held raw meat.
Clean and sanitise all boards, knives, benches and equipment used for raw food, change or launder cloths, and wash your hands thoroughly before doing anything else.
Leave the station clean and sanitised for the next user, restock single-use towel and sanitiser, and complete any cleaning or temperature records your food safety program requires.
Frequently asked questions
Are colour-coded chopping boards a legal requirement in Australia?
Colour coding is a widely used industry convention, not a specific legal requirement. The Food Standards Code requires you to prevent contamination of food, and separating raw from ready-to-eat is how you do that. Colours make separation easy to see and audit, but labelled or dedicated boards achieve the same outcome. Confirm any specific expectations with your local council.
Do gloves stop cross-contamination during prep?
Not on their own. Gloves get contaminated exactly like bare hands, so wearing one pair across different tasks just moves bacteria around. Gloves never replace handwashing. Wash your hands before putting on a fresh pair, change gloves every time you switch tasks or when they tear, and never handle ready-to-eat food with gloves used for raw meat.
What is the difference between cleaning and sanitising?
Cleaning uses warm water and detergent to remove visible food, grease and residue, which also removes most bacteria and allergens. Sanitising then reduces remaining bacteria to a safe level using heat or a food-safe chemical sanitiser at the correct concentration and contact time. Sanitiser does not work on a dirty surface, so you must always clean first, then sanitise.
In what order should I prepare food to avoid cross-contamination?
Where you share equipment or bench space, prepare ready-to-eat and lower-risk foods first while surfaces and hands are clean, then handle raw meat, poultry and seafood last. Clean and sanitise between task changes. This time-based separation stops raw handling from sitting upstream of foods that will not be cooked again to destroy bacteria.
How do I prevent allergen cross-contact when preparing food?
Treat allergens like any other contaminant, with extra care because you cannot see them. Prepare allergen-free orders first on freshly cleaned equipment with clean hands, use dedicated labelled utensils, avoid shared scoops, and physically clean surfaces between tasks. Cleaning is the key control because there is no cooking step that removes allergens. Always check ingredients rather than guessing.