relief

Halvor,

I'm following your adventure with interest.

That 3 mm is a wet coat, right? How do you measure it wet?

As for getting a high relief I think it is a function of dichromate
concentration, pigment concentration, and tissue thickness.

<Dichromate, >relief
<Pigment, >Relief
>Thickness, >relief

I believe this was referred to as "carving depth" by latter day carbon
folks. Too much pig and dichromate and you don't have the light penetrating
very deep into the tissue and thus less relief.

I've not tried to make a high relief tissue yet on my machine. It's one of
the ideas I need to explore in the future. It may prove to be impractical
as a machine made product. THis may be one advantage to making lay-down
tissue.

--Dick

At 05:01 AM 12/14/2004, you wrote:

>>Someone noted that sugar increases the speed at which the gelatin
>>dissolves/melts. This would be of help in the development. I do not know
>>if glycerin has the same effect.
>
>will test this at a convenient time..
>thanks
>
>>" While digital photography has broken the chain of light..."
>>Chain, thread, beam, or whatever, thank you for the interesting thought!
>>Vaughn
>I was trying to say too much at the same time, but it is an old thought I
>had from trying to understand photography, in one sense the only constant
>has been light - all the technology and techniques has had to adapt to the
>qualities of light, either as a compositional element or that which with
>the picture is made, also the print. an error in the exposure moves
>through the "chain", I suppose it relates back to the expressions as
>Pencil of Nature,.. and so on, but before I make more chaos here back to Carbon
>(thanks)
>
>>PS...my tissues are made with about 110 to 120 ml of geletin per 100 sq in.
>
>are right now using just gelatin and AmDiChro.. todays test was a 30 %
>solution High Viscosity Gel with 1 % dichromate, "coated" or poured into a
>clay mold on glass, making a 3 mm thick gelated coating, if I do this kind
>of test properly , the whole procedure takes 4 days which is stretching
>even my patience :) so I exposed it in gelated stage for 1 hour at a 1
>meter distance with a 2000watts mercury halide, cooling the sample with a
>fan during exposure, and straight in hot water. will have to wait for
>drying, but did not look too promising. looked like it was about the same
>thickness as a previous test with a 30 min exposure. which in dry state
>seemed to be about 0.2 mm. there should still be gelatin to "go on" there.
>
>(the woodburytype mentions up to several days development ?)
>
> I dont think the exposure went "through". The ammonium dichromate
> looks like it is filtering the UV as it has a strong orange colour,
> stronger than the slightly yellow tint of the gelatin.
>
>was thinking I should try to find the minimum possible ammount of
>dichromate to use - which would reduce the color, try spectral
>sensitisation, or of course try that patience and wait for things to dry
>down properly before I expose... reducing the distance.. or longer exposure..
>
>could not the dichromate be applied as a ratio to the gelatin content
>instead of the total volume of solution....?, okay it is not as simple as
>one amdichro molecule per two gelatin fibrils, but...
>
>I stop there and go back to the "why dont you try it"...solution.
>
>would like to see/establish how thick these materials will go though-
>
>halvor
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Received on Tue Dec 14 07:07:47 2004