In short: An airbrush sprays a mixture of chocolate, cocoa butter and oil onto a dessert — that is what produces a velvet finish. When choosing one, look at nozzle diameter, cup size and power type: a thick chocolate mixture needs a wide nozzle.
What it does
An airbrush is one of the more interesting tools available to a pastry cook. It is used to spray a mix of vegetable oil, chocolate and cocoa butter onto a cake, applying the liquid as fine droplets over a prepared surface.
Those droplets hit a frozen dessert and set on contact — the temperature difference is what creates the velvet texture, not the sprayer itself.
Nozzle diameter
The single most important specification. A narrow nozzle designed for paint clogs with setting cocoa butter within minutes. For chocolate mixtures, buy the widest nozzle available in the range.
Cup size and power
A larger cup means fewer interruptions to refill, which matters because the mixture cools while you stop. Mains-powered compressors hold pressure more steadily than battery models, and steady pressure is what keeps the coating even.
Cleaning
Clean it immediately, while the mixture is still warm: run hot water through, then take the nozzle apart. Cocoa butter that has set inside is close to impossible to remove.
Frequently asked questions
What nozzle size do I need for velvet
Wide. A narrow nozzle clogs with setting cocoa butter — buy the largest in the range.
How do I clean an airbrush after velvet
Immediately, while the mixture is warm: hot water through the body, then dismantle the nozzle.
Can I do velvet without an airbrush
Not properly. Aerosol cans exist, but they cost more per use and give you far less control.