This is a test of commonsense with single/multi-choices. Complete the next sentence:

How to make colored ice
Get out your ice cube tray and pour water into it.
Make sure you don't put too much water in, or else it will overflow and it will not work.
Add in the food coloring.

Pick from:
- Add 2 to 4 drops of food coloring into the water or you are done. The more colors you use, the faster you will get a color for your ice cube tray.
- Some people prefer to use color as the ice tonic. This way, you can achieve different colors! For example, if you want to make apple ice, use gel food coloring.
- ( the food coloring should be even, but it should look an a + + ) Add the ice cream. Stir continuously and keep switching at least every 5 minutes so it stays thick.
- The food coloring can be any color you want. The more drops you put in the darker it will be.
The answer is:
The food coloring can be any color you want. The more drops you put in the darker it will be.