Question: What supplies are needed to make a rainbow in a bottle?
Option 0: A small, opaque bottle        Food Coloring        Water        Salt        5 small beakers (or drinking cups)        Spoon or stirrer        Scale or electronic balance (or 1/2 teaspoon)        Pipette or medicine dropper
Option 1: A small, clear bottle        Food Coloring        Water        Salt        5 small beakers (or drinking cups)        Spoon or stirrer        Scale or electronic balance (or 1/2 teaspoon)        Pipette or medicine dropper
Answer: 1