If you are ever in London and visiting the British Museum (which I reckon we all would on this list ), turn right from the BM gates, and visit the artist supplies shop Cornelissen in Great Russell Street (also with mail order at
www.cornelissen.com/)<br>
<br>
An astonishing time warp of a place with its Victorian wood panels which still has huge glass jars filled with madder root, lapis lazuli, gum tragacanth, rabbits glue etc etc. I am seriously tempted to gild some equipment using their kit and advice.<br>
From their catalogue, some examples , on sale at the shop:-<br>
"Orpiment<br>
Arsenic trisulphide. Bright yellow and opaque.<br>
First used by the ancient Egyptians.<br>
Superseded in the Middle Ages by lead and tin yellows<br>
Realgar<br>
Arsenic disulphide. Yellow orange colour. First<br>
used by the ancient Egyptians.<br>
Litharge<br>
Lead monoxide. Pale yellow similar to Naples<br>
Yellow. Little use as a pigment but often used as a<br>
drying agent in varnishes. Used by Romans<br>
Gamboge<br>
Natural tree resin. Bright, transparent yellow.<br>
Soluble in alcohol and is often used as a colourant<br>
for alcohol based varnishes<br>
Lead Tin Yellow<br>
Bright yellow first used in the Middle ages as a<br>
replacement for Orpiment. Suitable for oil based<br>
media<br>
Vermillion Deep<br>
Synthetic Mercuric Sulphide. Bright, opaque red.<br>
In use since Roman times.<br>
Rose Madder<br>
Alizarin lake made by extracting dye from madder<br>
root and precipitating onto an inert base. In use<br>
since Roman times<br>
Verdigris<br>
Hydrated copper acetate. Early artificial pigment<br>
which dates from Roman times<br>
Malachite<br>
Greenish variety of native copper carbonate used<br>
as a pigment by ancient Egyptians.<br>
Synthetic Malachite<br>
Artificial Copper Carbonate<br>
Blue Verditer<br>
Copper hydroxide plus copper carbonate. Widely<br>
used in mid 18th century. Best in non oil based<br>
media<br>
Egyptian Blue<br>
Mixture of copper silicates. One of the earliest<br>
artificial pigments. Used in Egypt from about 3000<br>
BC then used by the Romans. Superseded by<br>
smalt. Suitable for fresco and distemper<br>
Azurite<br>
Native basic copper carbonate. Rare antecedent of<br>
cobalt and cerulean blues. Usage dates back to the<br>
Romans. Works poorly in oil and is therefore used<br>
primarily in aqueous media<br>
Genuine Lapis Lazuli<br>
Usage dates from the Middle Ages when it was the<br>
only reliable blue pigment. Different intensities of<br>
genuine ultramarine are caused by the varying<br>
intensifies of colour in the original lazurite vein.<br>
South American origin<br>
Smalt<br>
A variety of cobalt blue glass. Historically<br>
considered to be the direct continuation of<br>
Egyptian Blue. First made in the 17th century.<br>
Genuine Ivory Black<br>
Made by burning ivory scraps. Fine and intense<br>
with a high carbon content."<br>
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