Re: Sizing paper with gum and dichromate, was Re: glut

 
In a message dated 15/12/2005 14:28:48 GMT Standard Time, ctb@zeelandnet.nl
writes:

I tried gum sizing too and got the same greenish stain that would not
clear even after a long(er) disulfite bath and wash. Probably I
overexposed

A long exposure converts the dichromate to chrome oxide, which is green.
 
£0 seconds to a minute is sufficient.
 
TK
 
Terry King FRPS

RPS Historical Group (Chairman)

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Received on Thu Dec 15 09:40:16 2005