>The point is, Peter, have you discovered a way of photohardening it
>without using dichromate?
You are quite right - I haven't. But are you sure that a photo-polymer is
used - rather than an alternative sensitiser.
A few years ago I looked at Dunstan's work (we both had some in a show),
and I think at that time he was using dichromate, although I think the
nearest we got to any definite information from him on anything was that
wearing red underpants resulted in an increase in libidinal energy. My
observations on this theory are inconclusive.
Peter Marshall
petermarshall@cix.compulink.co.uk