2152Re: Water on plates
- Nov 3 6:56 AM
> but once exposed and dried and re-exposed so theThere is no question about it. The plates are water sensitive even after
> plate is fully hardened and ready to print, there is little or no effect of
> water ... on the plate
exposure and hardening. If you've experienced otherwise you've been lucky.
The moisture content of the plate material is what gives it its working
charecteristics. Too little, and the plate curls and craks, too much at it
is too soft to be effective.
From experience: An old plate that is curled up (because it's lost its
moisture) can be flattened by soaking. Droplets of water from cleanup mark
plates (still on press), by swelling, and these little marks do show up in
print. Paper that is too damp (poor dampening technique followed - another
subject altogether) will moisten the plate and cause the paper to adhere to
the plate. Old dry plates left to soak too long fall apart. Otherwise,
solvents from acetone to soy-solve do nothing to damage the plates.
Keeping the plates stable for long periods of storage is important.
Moisture sealing plastic wrap like Saran brand, or ziplock bags, or both
must be used, sometimes a drop of water in the package is needed, depending
on the weather at time of storage.
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