> Also, 12 hours is likely to be much too long for best results. As soon as
> dry, the better. Try two to three hours. I notice below that you develop
> 20-35 minutes and you do mention fog problems, so this is probably because
> drying goes on for too long.
I was under the impression that it took around 12-13 hours to dry freshly
coated carbon tissue. However, I was wondering about this? It seems
that once the gelatin has set and is reasonably dry it could be
sensitized, allowed to dry for say another 3 hours or so, and then used.
Is this true? It seems that the longer I let the tissue dry the worse it
wants to curl, and the more brittle it gets. Is this the reason that you
recommend drying for the shorter amount of time?
I have also been experimenting with the addition of varying amounts of
sugar in the mix. It looks to me like the sugar decreases the amount of
contraction of the gelatin layer, or at least allows it to dry slower
and more evenly. It does seem to make the gelatin layer a bit more brittle
though. Any thoughts on this?
- Wayde Allen
(allen@boulder.nist.gov)