RE: Two carbon questions

It should be about the same. I used Indian Ink
for a long time and as I recall the amount I used
was in the 20g/liter range.

I would suggest that you pour one tissue, allow
it to dry, and then look at by transmitted light.
If you can see through it then you need to add
more pigment. A moderate excess of pigment will
do no harm other than reducing the final
potential relief of the tissue.

Sandy

>Thanks Sandy. Will 15-20ml of indian ink
>equivalent to 15-20gr. of powder pigment or do I
>really need to weight the ink?
>
>-----Original Message-----
>From: Sandy King [mailto:sanking@CLEMSON.EDU]
>Sent: 13 Nisan 2006 Pers¸embe 16:02
>To: alt-photo-process-l@usask.ca
>Subject: 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 08:23:53 2006