Painting on cakes with food coloring seems so simple, but there are a few tips that you can use to
make it easier.
First, for these tips I'm assuming that you're painting on fondant. Painting on buttercream is more complicated so fondant is the easier place to start.
To do this stained glass cake I did the outlines of the shapes first using a food coloring marker. That will give you a light line to follow, but you could also paint it freehand.
The next step is to go in and put in the lighter colors. This will prevent the paintbrush accidentally picking up any dark colors and dragging it into the lighter areas while you're painting.
To do the color I used a titanium dioxide white food coloring with full-color mixed into it. You can then go back and add color to any areas that you want to be darker with the full-strength color.
If the white starts to bead up on the cake surface, mix some corn starch or powdered sugar into it. That will make it more resistant to the beading. If it's too thick, you can thin it out with vodka, but that can make it bead up more, so adding a little more corn starch will help. It sounds counter intuitive, but when you add the corn starch it makes it grip better but doesn't thicken it back to where it was to start.
When you're done painting the surface of the cake, let it dry completely, then go back and touch the color up using powdered food color. See the green leaf on the tier second from the top? And the more yellow sections on the middle tiers? Those were done with petal dusts. Use a large fluffy brush and dust away, it will give you a better depth of color and graduated shading.
When you're done with the color, paint the outlines of the shapes with a darker outline color. For this cake I used a dark brown with a little black in it since the black on its own looked too harsh.
Kara Buntin owns A Cake To Remember LLC, online cake supplies at www.acaketoremember.com and www.acaketoremember.etsy.com