Three things decide most cocoa butter spray results: the temperature of the colour, the condition of the mould and the spray pattern. As a starting point for mould work, spray coloured cocoa butter at around 31°C into a clean, dry mould at about 20°C, but always follow your colour supplier's instructions first. Keep the layers thin, test the pattern before every batch and write down the settings that worked. A filtered KADZAMA spray booth catches the greasy overspray, gives you a clear view of the mould and keeps colour work in one corner instead of across the whole kitchen.
Deep orange, rust, red, black and metallic finishes look simple on a design sheet. In the mould, a slightly cold gun or a single fingerprint is enough to turn a smooth gradient into droplets, dull patches or colour that stays behind in the cavity.
Seasonal ranges make this harder. Halloween and Christmas mean more designs, shorter runs and frequent colour changes, so a finish has to work on the fiftieth mould as well as the first.
Why cocoa butter spray results vary
Coloured cocoa butter has to stay fluid enough to atomise, yet thick enough to form a thin, even layer. If it starts to crystallise inside a cold gun, the nozzle spits or blocks. If it goes on too warm or too heavy, it pools in the mould.
The mould matters just as much. Dust, moisture, fingerprints and old cocoa butter residue break the contact between the colour and the chocolate shell. You see it as cloudy areas, or as parts of the design left behind when you demould.
Treat these as process settings, not as things you adjust by feel:
- coloured cocoa butter temperature;
- mould temperature;
- spray gun temperature;
- nozzle and compressor settings;
- distance and angle of application;
- number and order of colour layers;
- setting time before moulding.
No single air pressure suits every spray gun. Nozzle size, pigment load and the viscosity of the cocoa butter all change the pattern. Find the setting on a test surface and note it next to the colour and equipment you used.
A cocoa butter spraying workflow, step by step
1. Decide on the finish first
Do you need full coverage, a translucent wash, a gradient, fine speckles or a deliberately rough texture? The answer tells you how much colour to prepare and which one goes on first.
Remember that the order is reversed. Whatever you spray into the mould first ends up in the foreground of the finished chocolate.
Test the full design with the couverture you will actually use. A translucent orange can look bright over white chocolate and muddy over milk or dark.
2. Set up the spraying area
Move open chocolate, ingredients and clean utensils away. Cocoa butter mist travels further than you expect and settles as a greasy film on nearby surfaces.
Switch the spray booth on before you test the pattern, and check that the filters are fitted and the airflow is not blocked.
The KADZAMA booth has two filtration stages for the greasy mist, a stainless-steel working area and bright LED lighting, so you can see coverage clearly while the overspray stays inside the booth. It also has an adjustable bracket for the spray gun, which can be fixed on the left or right side, depending on which hand you work with. A scraper bar inside the booth lets you remove excess chocolate from the mould or spatula without moving to another station.
3. Clean and warm the moulds
Use dry, polished polycarbonate moulds with no visible residue. Check each cavity under direct light. Dark colours are especially good at hiding patchy coverage until it is too late.
Callebaut's mould-spraying method warms the mould to about 20°C. Colder than that, the cocoa butter sets before it levels. Much warmer, it stays liquid for too long and can run into pools. Try 20°C first, then adjust for your room and your mould.
4. Prepare the coloured cocoa butter
Use only food-safe, fat-soluble colour made for chocolate. For ready-coloured products, follow the supplier's melting and tempering instructions.
In Callebaut's published method the cocoa butter and colour are melted at 40–50°C, blended until smooth, sieved, crystallised and sprayed at about 31°C. The spray gun is heated beforehand so the cocoa butter does not set in the nozzle. See the Callebaut spraying method .
Before you fill the gun:
- mix until the pigment is evenly dispersed;
- pass the colour through a clean, fine sieve;
- check the temperature with a thermometer;
- warm the gun and the cup;
- prepare only as much as the batch needs.
5. Test the spray pattern
Spray onto a test surface, not into a production mould. You want an even mist, with no large droplets, dry edges or spitting.
Write down the temperature, compressor setting, nozzle, distance and number of passes. A simple batch sheet means the next operator can repeat the result without asking you.
If the pattern is poor, do not move closer and add more colour. A thick layer pools, hides the fine details of the mould and can peel off the finished shell.
6. Build up thin layers
Keep the gun moving and overlap each pass slightly. Start spraying just before the mould enters the spray path and release the trigger after it has passed. This avoids a heavy deposit at the beginning and end of each pass.
For a multi-colour autumn or Halloween design:
- Spray splashes, veins or stencil details first.
- Let the layer crystallise.
- Add gradients or larger areas of colour.
- Finish with a backing colour if the design needs more opacity.
- Let the last layer set before adding tempered chocolate.
Callebaut suggests resting the sprayed mould at room temperature for a couple of minutes. Thick layers and warm rooms take longer, so check that the surface has actually set rather than watching the clock.
Three finishes for autumn and Halloween ranges
Autumn leaf gradient
Use amber, red and a darker brown or burgundy for a gradient that runs in one direction. Spray the darkest accent first, then work towards the lighter colours.
Keep every layer thin. Too many overlapping passes turn a transparent gradient into a solid block and soften the detail of the mould.
Pumpkin speckle
Spray dark speckles first, then the orange layer. Changing the droplet size gives the surface more texture, but test the pattern before every production batch.
Make one approved reference mould and compare each new batch with it under the same light.
Halloween contrast
Black, purple, green and orange give strong contrast, but dark couverture takes the brightness out of translucent colours.
Test on a shell before you approve the palette. If your colour supplier allows it, a lighter backing layer can lift a weak colour. Metallic and lustre colours must be sold specifically as edible and suitable for your application. "Non-toxic" is not the same thing.
Cocoa butter spray troubleshooting
| Problem | Likely cause | What to check |
|---|---|---|
| Large droplets or spitting | Cocoa butter cooling in the gun, a partial blockage or unstable pressure | Check the temperature, warm the gun and clean the nozzle |
| Colour pools in the mould | Layer too heavy, too warm or sprayed from too close | Use thinner passes and re-test the distance and settings |
| Dull or cloudy finish | Dirty mould, wrong temperature or poor crystallisation | Re-clean the mould and check the mould and colour temperatures |
| Colour stays in the mould | Layer not fully set, contaminated mould or chocolate out of temper | Check mould cleanliness, setting time and the temper of the chocolate |
| Weak colour over dark chocolate | Layer too translucent for the couverture | Test a second thin pass or a compatible backing colour |
| Different results from different operators | Settings and technique are not written down | Create a batch sheet and an approved reference sample |
| Coloured mist settles around the room | Overspray is not contained | Use a filtered spray booth and check the condition of the filters |
Where the KADZAMA spray booth fits in
A booth will not fix badly crystallised cocoa butter or a wrongly set gun. What it does is keep the mist in one place, so you can see what you are spraying and the rest of the workshop stays clean.
The KADZAMA Painting Spray Cabin is designed for even colouring of confectionery and chocolate with cocoa butter or other sprayable food colours, and it works well with polycarbonate moulds. KADZAMA states that it reduces production contamination by up to 95%. The fan draws the mist in through two filtration stages, and it does not need to be connected to an external extraction system. The working area is stainless steel, and a disposable additional filter makes routine cleaning easier. IP54 LED lighting is protected by extra glass panels, so dye particles do not build up on the lamps.
Technical specifications:
- Dimensions: 850 × 500 × 975 mm
- Weight: 40 kg
- Electrical supply: 220 V / 50 Hz
- Rated power: 0.35 kW
- Noise level: up to 60 dB
- Warranty: 1 year
The spray gun is not included. KADZAMA's website is a catalogue rather than an online shop: after you place an order, a manager contacts you to confirm delivery cost and payment method. The minimum order is €200. If you are in the UK, ask the manager about the plug and electrical connection before ordering.
Making the finish repeatable
Before you move from samples to a full seasonal batch, write down:
- colour brand, product code and lot;
- melting and working temperatures;
- mould temperature;
- spray gun and nozzle;
- compressor setting;
- order of colours;
- number of passes;
- setting time;
- room temperature;
- the accepted reference sample.
Where the design allows, change colours from light to dark. It is easier to inspect, and a trace of dark colour left in the gun will not spoil the next finish.
Check the spray pattern at the start of each session and after any break long enough for the gun to cool. On longer runs, make the condition of the filters part of the operator's routine check.
Frequently asked questions
What temperature should coloured cocoa butter be for spraying?
About 31°C is a good reference point for mould spraying, after the cocoa butter has been melted, mixed, sieved and crystallised. Formulations differ, so follow your colour supplier's instructions and note the temperature that gives you a stable pattern.
Should chocolate moulds be warm before spraying?
They should not be cold. Callebaut's method warms them to around 20°C with a heat gun. What matters more than the exact number is that every mould in the batch is clean, dry and at the same temperature.
Can I mix water-based food colouring into cocoa butter?
No. Use a fat-soluble colour made for cocoa butter and chocolate. Water-based colour does not belong in a fat system and will spoil it.
Is mould spraying the same as a velvet finish?
No. Mould spraying puts a thin layer of colour into the mould, and the layer transfers to the chocolate shell. A velvet finish relies on thermal shock and is sprayed onto a frozen product. Callebaut specifies −18°C for its velvet method. The surface conditions are completely different.
Does a spray booth replace process control or protective equipment?
No. It contains the overspray and gives you a defined place to work, but you still need hygiene procedures, control over your ingredients and any protective measures your own risk assessment calls for.
Set up your colour station before the season starts
Treat temperature, spray pattern and layer order as production parameters. Validate each design on the chocolate you will actually use, keep an approved reference sample and give every operator a written setup.
Have a question about the spray booth or need help choosing equipment for your workshop? View the spray booth specifications or talk to the KADZAMA team.
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