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#11
July 29th 05, 05:44 AM
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On Thu, 28 Jul 2005 21:40:30 -0700, in hõ Mr G H Ireland
wrote: In article , William Black wrote: Rouge is easy to make, it's essentially ground up rust I thought rouge was made by calcining, (i.e. roasting) green vitriol, the old name for ferrous sulphate, different colours (and so, probably, different hardnesses/ particle sizes) being obtained by different times and temperatures of the calcining. G.H.Ireland Most likely, there are several ways to produce rouge. Different colors are most often, so far as I know, different actual chemicals. Green rouge, for example, is Generally Chrome oxide, not iron oxide. 
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