Pour uncooked pasta into large plastic bag. Use separate bags for each color you want to dye.
Pour 1/4 cup of rubbing alcohol per 2 cups of uncooked pasta into the plastic bag.
Add 1 tbsp. of food coloring to the plastic bag. Use more food coloring for darker, more intense colors.
Close the plastic bag, being careful to seal completely.
Shake the plastic bag to mix food coloring, alcohol and pasta.
Leave the pasta in the bag for at least one hour while it absorbs the food coloring and alcohol.
Turn the bag over and let pasta sit for another 30 minutes to ensure even absorption.
Pour the colored pasta onto newspaper or wax paper and let dry completely, preferably overnight.