Turquoise is an opaque blend of green and blue pigments. The name stems from the French 'Turquoise' for the semi-precious stone that was exported to Europe from Persia via Turkey.
Winsor Emerald is a bright clean opaque emerald colour. First documented in 1822, it originally contained arsenic, and is said to have killed Napoleon as his wallpaper in St Helens was emerald green...
Sepia is a black brown colour. Originally made in the 18th from the ink sacks of cuttlefish, it is now made from a mixture of carbon and umber. It is a highly permanent colour.
