Seeing as the frame has an anodic film (really, just a colored electrolytic oxide layer) I doubt this will be easily remedied. the under surface will be self color and will form its own natural oxide film but - of course, self color.
We all know probably how hard it is to match white paints - equally I'd think it very hard to get such a good match on the frame that the blemish can be disguised, without looking even more apparent.
I guess experiment! If color not up to snuff - clean off straight away. You may hit lucky but I'd doubt it!