"Don't try a medium you've never used before on a piece you intend to finish" is advice I give to others, and advice I try to follow
And I just ruined some pictures with paint thinner in an attempt to blend out colored pencil. The thinner STAINS the paper?? It has a color of its own?! I might be able to recover something but it's absolutely not going to be what I wanted from these drawings. That's frustrating! I know better than that!
It leaves the paper translucent in a way I don't like and I have zero way of knowing if it'll dry out but I am not counting on it. Damn.