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A Colour A Day: Week 45

Ruth Siddall31 January 2021

A Colour A Day: Week 45. 25 – 31 January

Jo Volley writes…

This week we have seven beautiful copper based pigments manufactured by Ruth Siddall who says of them:

‘Of this set of seven pigments, four are derived from natural mineral samples and three are synthetic. Two are made by reacting metallic copper with vinegar plus or minus salt to produce verdigris (copper acetate) and atacamite (copper hydroxy chloride). The final synthetic pigment is a precipitate of copper carbonate formed by mixing copper sulphate solution with sodium carbonate solution. The natural minerals were bought from reputable mineral dealers and were sourced from copper mines in the Katanga region of the Democratic Republic of Congo.

All pigments bound in gum Arabic on W&N watercolour paper and read from left to right:

Copper Carbonate
Malachite & Azurite
Malachite
Verdigris
Synthetic Atacamite
Azurite
Malachite & Chrysocolla