Crystal Christmas Trees Recipe Materials You'll Need Hot Water: 3 cups (750 ml) Borax (Sodium Borate): 9 tablespoons Tree Bases: Heavy cardboard, pipe cleaners shaped like trees, or sponge pieces Food Coloring: Optional Container: A wide-mouthed glass jar, plastic container, or bowl large enough to hold the trees without them touching the sides Step-by-Step Instructions 1. Prepare the Solution (Adult Step) Heat the Water: An adult should heat 3 cups of water until it is very hot or boiling. Pour