Pour the white glue and shaving cream into a small bowl and use a stick to thoroughly mix them together. Take your time and don’t mix them too fast. You don’t want to “deflate” the shaving cream. Once they’re mixed together, add the food coloring and stir it in. For fairly vibrant colors try 10-12 drops, to begin with, then add a couple drops more if you want more color. Mix up a few colors, and get ready to have some fun.