Egg Yolk Paint
|Egg yolk||1 , beaten|
|Assorted food colorings||6 Drop (paste or liquid food coloring, adjust quantity as needed)|
Combine egg yolk and water, and stir well.
Divide mixture into several custard cups; tint as desired with food coloring.
Keep paint covered until ready to use.
If paint thickens, add a few drops of water, and stir well.
Brush paint on cookies as directed before baking.