Re: Sugar and or Glycerin

Hello!

Going from my experiences, and posts I have read before, this is what I know...

I have to limit the amt of sugar/glycerin as I live in a cool humid climate
(15 to 20C, 60% to 90%RH). I can not air-dry (w/fan) spirit-sensitized
tissue in a reasonable amt of time if there is an excess of sugar/gly...and
from painful experience, damp tissue results in distroyed negatives. The
tissue I make would curl up and then crack in a dry climate. I am not sure
how Dick resoloved this issue in the commercial carbon tissue he is making.

In helping to retain water within the gelatin, both would help to increase
the relief (I am assuming the retention of water would reduce the amount of
shrinking as the print dries.)

Someone noted that sugar increases the speed at which the gelatin
dissolves/melts. This would be of help in the development. I do not know
if glycerin has the same effect.

" While digital photography has broken the chain of light..."

Chain, thread, beam, or whatever, thank you for the interesting thought!

Vaughn

PS...my tissues are made with about 110 to 120 ml of geletin per 100 sq in.

>I understand the main point with both is to keep the dry gelatin from
>cracking up or avoid brittleness. And different recipies often comes
>from different kinds of gelatin.
>
>What is the practical difference, if any, between the use of these these
>two ?
>
>Halvor

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Received on Mon Dec 13 09:37:44 2004