Hi Pat, Even if there are pre-made colors you’re still going to have to tint it. One thing I can guarantee you, if it’s a pre-made color, whether it’s epoxy/polyester Colored fill or grout paint it’s not going to match the color chart exact from what you picked.
In my epoxy/polyester tool box that I put together I have superior travertine filler and knife great clear. Along with the color kit which comes with about eight different colors. One can make any Color needed.
If you go to YouTube you can look up how to mix & make colors.