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Re: Argyrotype
Sandy,
Tween merely facilitates the proper degree of absorption of sensitiser by
the paper and is not always necessary. It is generally needed when there is
a lot of image wash-off during processing, though some papers are just
unsuitable. 0.2 cc is, I believe, an average figure that appears to suit
the greatest number of papers. Have not used other wetting agents, but see
no reason why they should not work.
Liam