Rinse 2/3 of the spaghetti in water, then separate the spaghetti in half into two-gallon size zip closure bag.

Place the red coloring into one, the blue into the other and mix each with two tablespoon water, blend gently until the colors are absorbed.

You can rinse the excess color off the pasta before mixing them together.

For the remaining 1/3 of the pasta, add the olive oil to it, so the other colors don't rub onto the natural color of the spaghetti.

Mix the spaghetti noodles together just before serving, if you mix them ahead of time the colors may transfer to the other noodles.