Re: Clearing Gum/Carbon
Hans Nohlberg (chiahans@tripnet.se)
Sat, 13 Jan 1996 01:55:49 +0200
>> dont remember seeing any dichromate at that stage on it. (How about you
>>> Sandy?) The image and its final support get another few minutes of hot
>>>
>>No, I too was very confused as to what Hans meant in his statement
>>about a dichromate stain on the STS. I presumed he was talking about
>>three-color work of the type you describe. I follow procedures
>>very similar to yours in working three-color carbon and carbro and
>>have never seen even the slightest hint of a stain on the STP. When
>>the color reliefs are developed on plastic the image develops
>>absolutely clear, with no trace of dichromate, at least this is the
>>case with the temporary plastic carriers I use (a polyester product
>>called Kal-glas).
>
>There you go Hans. The Masters have spoken;-) What is your procedure?
We have just made a final transfer. Shall we send you the yellowish STS?%>))
The procedure we use is what you describe as triple carbon (almost):
Y-exposure, transfer, development on plastic, drying;
M-exposure, transfer to the plastic with Y-layer, development etc;
C-exposure, transfer to the plastic with YM-layers etc.
This means - very often - a rather thick layer. After drying we transfer to
a STS (paper). Dry and peel off the plastic. Then transfer to final paper
in warm water. And the thrownaway STS is yellow where the thick and dark
parts from the image were. After drying we clear in pot meta bisulf, dry
again and finally we harden in formaldehyde (will try glyoxal later on).
That is our process. Another master has spoken:>))
Hans & Chia