Re: Lens problem - fungus??

Paul Friday wrote:


> And bones - never get it on your skin.

Isn't that the stuff that goes through your flesh and destroys the bone
underneath.  Nice stuff.  Interestingly apparently some of the damage
wrecked by fungus is the fungus excreting hydrofluoric acid.  How does it
do it without killing itself?

To lower the tone, you think you've had it bad after a curry...

I spotted in an old photography book instructions on etching a photo onto
glass.  It involved coating the glass with a albumen and a sensitising
agent and at some point using bitumen powder, to act as a mask, the
bitumen
adhering to the emulsion created with the albumen and sensitising agent. 
All fine up to now (ok powerdered bitumen anyone).  I decided not to
bother
when it required the glass plate to be held over fuming hydroflouric acid.

-- 
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