Glycerine in tissue

Dick,

Another thought to much on.

I recently increased the amount of glycerine in my tissue from about
10ml per 1000ml of coating solution to 50ml. This increase has had
some interesting results. First, the tissue is much more pliable and
the tissue plus paper (standard here is the thin unpasted wallpaper)
is much tougher. Another good result is that the tissue is much
cleaner working and there is very little base fog (stain on the edges
beyond the exposed area).

On the negative side, I am concerned about how sticky the tissue is
after it is sensitized and dried. I just made a test print from a
12X20 negative with tissue that was spirit sensitized with ammonium
dichroamte mixed 1:2 with acetone. There is no question but that the
tissue was dry as I left it for about 20 minutes exposed to a fan.
But after I exposed the tissue with my HID mercury vapor lamp it was
pretty difficult to separate the tissue from the negative, in fact
for a while there I thought I had lost the negative. Ultimately it
peeled away without any damage but this experience has left me a bit
wary about the high level of glycerine. With the rest of this batch I
will expose through a thin sheet of sacrifical mylar.

Any glycerine alternatives out there other than sorbitol?

Sandy

>Sandy,
>
>Thanks. Some nice info to munch on.
>
>Yappy New Year to all as well.
>
>--Dick
>
>
>
>
>At 11:35 AM 12/31/2001 -0500, you wrote:
>>A while back Vaugh and I exchanged some messages regarding length
>>of development for carbon. You might recall that our methods
>>contrasted significantly in that with my method development was
>>ended at 6 minutes, while his called for up to 15 minutes or more.
>>Having done some testing and printmaking during the past several
>>weeks with very thick emulsions I am now going to suggest that our
>>different experiences result primarily from the use of tissues of
>>different thickness. In the past my carbon tissue typically
>>consisted of about 100ml of gelatin solution per sheet of 11X14
>>tissue. On development, if exposed correctly, I can strip this
>>tissue from the support at about two minutes and complete
>>development in 6 minutes. with the new thicker tissue I have been
>>experimenting with - which uses about 200ml per 11X14 sheet - I
>>have to wait for at least three minutes to strip the tissue from
>>the support, and development is not complete until around 12-15
>>minutes.
>>
>>The advantage of the thicker tissue is that your get much greater
>>relief, provided of course that you decrease the amount of pigment
>>proportionately and transfer the image to a relatively hard surface
>>paper. The advantage is with art papers as there is virtually no
>>difference in dimensional effect between very thick and very thin
>>tissues.
>>
>>Wishing everyone a Happy New Year. May there be many great carbon
>>prints in your future!!
>>
>>Sandy King
>>
>>
>>
>>
>>_______________________________________________
>>Carbon mailing list - Carbon@opusis.com
>>http://rmp.opusis.com/mailman/listinfo/carbon
>
>_______________________________________________
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>http://rmp.opusis.com/mailman/listinfo/carbon

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