Quote Originally Posted by gmikol View Post
Most carbon printers know (or at least should know) that dichromate-sensitized tissues are quite sensitive to relative humidity (or more properly, the moisture content of the tissues), which affects speed and contrast.
--Greg
Off topic a bit.

Well, I just learned that the hard way. Recently used three tissues I made a few months ago. Had good notes from my initial prints. Used the exact same negatives, sensitizer & exposure times. Now wanting to make the most of my limited time, I exposed & mated all three.

Upon development - No tone/paper white until around what should have been zone 7. OOPS

But I fixed the blister problem