How could I put different tints on one material? (SOLVED)

Is there a way that I could have a lot of different tints on a texture, using only one material? For my app, I need the user to type in RGB numbers, and it needs to display the tinted texture on the screen. Since there are a lot of combinations for RGB numbers, I want to only use one material. I could create a new material every time the user types in RGB numbers, but eventually that would make the app laggy with all of the new materials. Is there any way to make multiple tints on one material?