Twice now (out of many dozens of pictures framed) I've seen a cloudy deposit
on the inside of the glass over the photo (not over rag mat).  It's in a
regular pattern (one was vertical fuzzy stripes, the other like the pattern
of a brain).  My best guess is it's something in the ink.  Cleans off fine.

Epson 2200, Epson ink.  I let them dry a few days, then dry 4 minutes under
a heat press (not touching) before mounting with dry mount.  I clean the
glass meticulously with Glass Plus, and use a paper backing on the frame.
I'm in a wet area (N. California coast), but it isn't moisture, as it stays
in that same pattern for weeks.  No direct sunlight.  Any guesses?

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- Alan Justice