Resin color

I am printing with clear resin.  As the piece come out of the machine, it looks crystal clear, but after the alcohol rinse, it has a blue gray tint.  Is the alcohol etching it?

Is it possible to use denatured alcohol in place of IPA?  Denatured is cheaper.

The resin tends to have a slight bluish tint to it under certain lighting conditions. It can be seen very clearly in sunlight, especially. If you’re talking about the hazy, whitish translucent “skin” that forms after a part comes out of the alcohol bath while it dries, I believe this is caused by water in the part drying slower than the alcohol, as I’ve noticed higher purity alcohol hazes less.