Colour-changing cake for artists – Video of the day

The two cakes in the video include a quarter sheet cake in pink, orange, yellow, green, blue, and violet; and an eighth sheet cake in yellow, green, blue, and violet. The quarter sheet is iced in Bettercreme (a whipped topping type icing), and the eighth sheet is iced in buttercream (palm oil shortening base). I recommended a freshly iced cake because a cake with dry icing will not comb smoothly.

This effect can be achieved with just two colors, although I recommend complementary colors, as not all overspray can be prevented.

The airbrush I use is a Bakery Crafts brand (now owned by DecoPac), set at 10 psi. The airbrush colors I use are DecoPac brand colors. And yes, I hold the airbrush weirdly because my index finger locks up; so I pull the trigger with my thumb, and have done so for … 13 years now.
The icing comb and turntable are nothing special, and can be found in any craft store that has cake decorating supplies.