Copper





(Copper Sulphate, Verdigris, Blue Vitriol, Blue Copperas,

Bluestone.)



Copper is rarely used as a mordant. It is usually applied as a

saddening agent, that is, the wool is dyed first, and the mordant

applied afterwards to fix the colour. With cream of tartar it is

used sometimes as an ordinary mordant before dyeing, but the colours

so produced have no advantage over colours mordanted by easier

methods.





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