Re: Two carbon questions

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 06:30:56 2006