Re: additional information on semi success

David,

My preliminary opinion is that you are correct in that the tissue had
too thin a coating. If not that, then the sensitizer was much too
strong and/or exposure was excessive. This could also lead to very
weak shadow densities and low contrast images. However, I would need
more information to comment with more assurance on your recent carbon
experience, including the following.

1. Composition of the pigmented gelatin mix.

2. How much solution was used to coat a support of specific size, and
how was this carried out.

3. Method of sensitizing.

4. Steps followed after exposing the sensitized tissue, including
time and temperature for all soaking steps.

I would comment that when using a pigmented gelatin solution of about
40g of Sumi Ink per 1000ml and an ammonium dichromate spirit
sensitizer of 2% diluted 1:2 the Dmax of my shadows with carbon
prints, as measured by the densitometer, is well over log 1.9.

Sandy King

>when i pulled the temp. support away from the final support i understood
>that all i would see was a mass of gelatin but what i saw was the total
>image. was this because the amount of gelatin on the temp. support was
>to thin?
>
>thanks
>david
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