On Wed, 13 Aug 2003 15:53:06 +0100, "Smeckler"
wrote:


The white stuff was "anhydrous copper sulphate", i.e. with all the water
removed...

maybe, but as you observe, it needs a lot of heat to produce and
absorbs water from the air very quickly (turning blue again). BM is
made from a mixture of copper sulphate and slaked lime. It's the
slaked lime that leaves the white deposit long after the CuSO4 has
dissolved/been washed off.
--
Derek Turner

Outlook Express is worth precisely what you paid for it.


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