Re: Two carbon questions

Loris,

Sorry, that should have read 15-20 grams of pigment per liter of
gelatin solution.

Sandy

>Loris,
>
>There is no way to think to compulsively with carbon because there
>is always some variable waiting to smack you in the face if you
>don't control it.
>
>But, in answer to your question, just freeze the glop you want to
>use later in a plastic container, leaving a little room for
>expansion. You can keep it frozen for months without damage.
>
>If you keep the lid on the bottle when heating it there will be no
>loss from evaporation.
>
>If using tube watercolor pigments, try about 15-20 grams.
>
>
>
>Sandy
>
>
>>I plan to make a normal contrast tissue using indian ink. I want to
>>prepare the gelatine + sugar + ink solution beforehand (will coat
>>the tissue later). Sandy's carbon and carbro book says that the
>>gelatine solution can be refrigerated for later use (remember
>>reading this somewhere else too). I tried to refrigerate gelatine
>>solution once (about 250ml, 10%) and after about 2-3 weeks in the
>>fridge, the water was evaporated completely leaving only dry
>>gelatine in the bottom of the vessel - it was fun to play with the
>>dry gelatine disk later ;)
>>
>>1) Does it mean that I have to fridge the gelatine solution in a
>>hermetic container? (I guess yes but I want to hear others would
>>say...)
>>
>>2) Won't heating the gelatine solution before coating or leaving it
>>about 2 hours in a warm water (45C) bath to have the bubbles
>>expelled (after adding the pigment and stirring vigorously) reduce
>>water in the solution (due evaporation) considerably? How this will
>>affect the working characteristics of the solution? Am I thinking
>>too compulsively?
>>
>>I plan to start with batches of 500ml... I aim for a tissue with
>>normal contrast / moderate relief. (Any suggestions for pigment
>>quantity? I want to make a tissue with 1mm wet thickness.)
>>
>>TIA,
>>Loris.
Received on Thu Apr 13 07:03:07 2006