Re: acetone

On Dec 22, 2006, at 9:06 PM, Vaughn Hutchins wrote:

>
> Of course, relief was not unknown back then -- it is the basis of
> the woodbury printing process...hope I got that spelling right. If
> I understand the process properly, molten lead was poured over a
> high relief carbon print (but I think they left out the carbon!).
> The resulting plate was then inked and pressed onto paper to create
> an image.
\
Merry Christmas to all.

Vaughn, according to Crawford, the Woodbury process started with a
high relief dry gelatin image (0.005 inch high in the shadows) and
then a mold was made by pressing the image against a lead block with
pressures on the order of 5 ton/square inch! This gave a mold which
was filled with melted pigmented gelatin and then pressed against a
sheet of paper to transfer the image.

Howard
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Received on Sun Dec 24 18:41:00 2006