Re: Copy of: Re: Gravure & Sulphur Polution

Peter Marshall (petermarshall@cix.compulink.co.uk)
Tue, 20 Aug 96 11:31 BST-1

In-Reply-To: <01I8H209ZKCIDU6R86@wvnvms.wvnet.edu>

Blue colour on copper plates

My vote on this (and I did see the plates) is that it was most probably an
very thin oxide layer. The colour of these depends on thickness.

Hydrated copper(II) compounds have only a pale blue colour and could not
account for the density, although of course ammonia forms much more
intensely coloured complexes with copper(II).

Peter Marshall

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