Separate the cooked pasta into 3 portions, rinse 2/3 of the spaghetti in water, then separate the spaghetti in half into 2 separate gallon size zip closure bag. Place olive oil on the "plain" pasta.
Place the red coloring into one bag, the blue into the other bag and mix each with two tablespoon water, blend gently until the desired color is absorbed into the pasta.
You can rinse the excess color off the pasta before mixing them together. If you feel there is excess liquid. But not necessary. The pasta can be blotted to avoid transfer of color as well.
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. If you haven't already done so.
Mix the spaghetti noodles together JUST BEFORE SERVING, food colrs do transwer, if you mix them ahead of time the colors may transfer to the other noodles.
