cyanotype on glass ( how to clean the glass and other stuff)

Dear list,
A student of mine (Kelly) wants to do cyanotype on
glass. She has been fallowing Galina's technique
published in the Christopher James book, but we can’t
figure out with what to clean the glass. I found that
the C. James book recommends something called
"rottenstone" but I don’t know what this is or where
to get it.
And a couple of more questions: The formula for the
sensitizer calls for one part "prepared" gelatin to
two parts sensitizer, is this prepared solution a
combined mix of gelatin and hardener such as glyoxal?

What is the easiest way to coat the glass?

Thank you kindly

Carmen and Kelly

                
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Received on Wed Jan 26 13:07:15 2005