Easiest Way to fade back and forth between two colors

I need two different base colors for my show and then in different scenes, there are different blends of the two colors (for example, if the colors were red and blue the scenes would be different shades of purple). Is there an easy way to be able to pick the two colors then just decide on the percentage of each color?

I'm doing some lighting design for the theater club at my college. I'm pretty new at this so sorry if this is a dumb question or if I'm not explaining it well. 

Thank you for any help or advice!

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