Re: material for tissue in dry climates

Hi Clause,

Add glycerine to the pigmented gelatin. In a very dry climate I would
suggest adding up to 20ml of glycerine per liter of pigmented
gelatin. This is in addition to sugar, which I always add at about
25g/L per liter of pigmented gelatin.

In a very humid climate glycerine should not be added as it will make
the tissue virtually impossible to dry. In my own working conditions,
where the RHy is on the order of 45% in the winter and 60% in the
summer I vary the amount of glycerine from a low of 5g/L to as high
as 20g/L.

When you add glycerine check the condition of the tissue very
carefully before exposing to make sure that it is bone dry. If you
expose before the tissue is completely dry you risk ruining your
negative. Which brings me to suggest that you always expose with a
piece of mylar between the tissue and negative. Better to ruin a
piece of mylar than a valuable negative.

Good luck,

Sandy

I live in South Carolina where the humidity is very high in the summer months

>The tissue I have been making has been really hit or
>miss. I have been using Strathmore Bristol Vellum and
>coating with a Knox gelatin watercolor mix. I live in
>Nevada where the humidity is sometimes in the single
>digits - VERY dry out here. The carbon tissue I have
>made curls badly and is stiff as a shingle after
>drying. I tossed my last batch because of this. I
>tried using some palstic that I found in the WalMart
>fabric section, but after the gelatin dries, it too
>puckers and curls, and is damaged when one tries to
>use it.
>
>So, I am asking for suggestions to adapting the
>process to dry climates. Any better support papers? I
>like the idea of the plastic, but the results for me
>were not any successful.
>
>This is my first posting to this list, and I only
>started exploring the carbon process this summer. This
>list has been a great resource, thanks.
>
>Regards,
>
>Claude
>
>// Claude Sapp
>// telephone (001) 775 247 5362
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Received on Mon Sep 12 08:53:21 2005