Multiply Decal?

Joopson

If I have a decal that I just want to darken the surface it's on, (say, a nail hole, or bullet hole), is there a way to mimic the multiply blend-mode, with a decal?

I can't quite figure out a good enough way to fake it, at the moment. But it'd be a really convenient option to have.

Joopson

I found a sort of work-around; my texture was black and white, so I inverted it and used it as the opacity, and just used black as the diffuse. Worked ok for the scenario.