Equally separate the mixture into three bowls or measuring cups (about a cup in each). Using food coloring, mix up your 3 colors (purple, green, yellow). For the bright purple, use 6 drops of neon purple food coloring. For the green, use 10 drops of neon green food coloring plus one drop of neon blue food coloring. For the yellow, use regular yellow food coloring (about 8-10 drops).