[pure-silver] Re: Dry Plates Today
- From: Jean-David Beyer <jeandavid8@xxxxxxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Thu, 28 Feb 2019 08:59:06 -0500
On 2/28/19 1:22 AM, `Richard Knoppow wrote:
A good pamphlet about the half tone process is at:
https://www.getty.edu/conservation/publications_resources/pdf_publications/pdf/atlas_halftone.pdf
That is an interesting pamphlet.
Eventually, self-screening films and plates were devised which did
away with the need for the difficult and dangerous wet plate process and
also with the delicate and expensive cross-screens required.
Once Kodak (and perhaps others) came out with lithographic films, the
wet plate process was no longer required*. I have made half-tone images
with the Kodak film using my enlarger from negatives. My half-tone
images were positives, whereas making printing plates usually requires
negatives. That is easily done by making a contact print from one to the
other. This actually improves the results because the contrast of the
litho film is not really quite high enough.
I have two Levy half-tone screens, generously given to me by the Max
Levy company of Philadelphia.
_____
* I did know a retired photo-engraver who made plates for newspaper
plants in New York City. These plates were made custom for each press,
and they had to be "stretched" just right so the three or four colors
would line up in spite of the paper expanding with the solvents in the
different color inks. Each press (most newspaper plants had more than
one) was different, so each plate was made for a particular press.
He told grizzly stories about a horrible manager who got cyanide in his
tea.
--
.~. Jean-David Beyer
/V\ PGP-Key:166D840A 0C610C8B
/( )\ Shrewsbury, New Jersey
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