from what i remember from high school genetics. There are dominate and recessive traits in each cell.
so I would get a whole batch of seeds from hybridization and hope they come up with the right thing. because you don't know if you have a DS, a DD, or a RR. D for dominate and R for resissive because DS and DD make the same thing...
so hybridize and grow all the seedlings, and you'll know if you got the right thing by what they look like.
But if you looking for a color, mix two roses that contain at least a little of that color. That might help...