Re: Standard formula

I'm at work right now, so I'm not sure what turn of the century books it
came from, but I do remember that using glycerin is a real taboo to early
carbonest,Woodburyest, sugar or honey was not. to much glycerin can make
mush out of your image.

----- Original Message -----
From: "Richard Sullivan" <bostick@screaminet.com>
To: <carbon@opusis.com>
Sent: Wednesday, December 26, 2001 2:45 PM
Subject: Re: [Carbon] Standard formula

As per my thoughts on high glycerine content I am a little wary at this
point. Too much might make it sticky in a high humidity climate.

I know it never happens but I have night mares about someone in Key West
calling up asking me how to get their neg unstuck from the tissue. I have
to optimize for all kinds of conditions. Although better stifff when dry
than sticky when humid.

--Dick

At 03:23 PM 12/26/2001 -0500, you wrote:

>Dick wrote:
>
>>>
>>>Sugar - Some of this organic material is needed to make the process work
>>>and to give pliancy to the tissue. Too much makes the tissue brittle!
>>
>>
>>But if my observation is correct, a big but, glycerine counteracts this
>>tendency.
>
>
>That is my observation as well. In a recent test I increased the amount of
>glycerine from my normal of 5-10ml per 1000ml of pigmented gelatin
>solution to 50ml per 1000ml. There was very little increase in image
>contrast with this change, if any, but the resulting tissue has much
>greater pliancy and is easier to work with. This is really useful in the
>winter because with low humidity the tissue typically dries excessively
>and the edges of the paper/gelatin become as the edges of a sharp knife.
>Can't tell you how many times I have actually suffered serious cuts from
>dried tissue!!
>
>>
>>
>>Increasing of contrast is an issue still in contention with me. It
>>doesn't seem to be the case but again, only my cursory observation at
>>this point.
>
>
>I did not observe it either with the quantity of glycerine noted above,
>i.e. 50ml of glycerine per 1000ml of pigmented gelatin solution.
>
>
>
>Sandy
>
>
>
>--
>
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Received on Wed Dec 26 15:06:11 2001