COLOURS. 415 



buffalo. In the East Indies it is a very common 

 and cheap colour ; the natives there use it com- 

 monly for colouring their calicoes, which they do 

 without any mordant, so that the colour is washed 

 out again when the cloth is dirty. 



King's yellow. This colour is orpiment refined, 

 which is a substance dug out of the earth, and 

 consists of sulphur joined to arsenic 5 or it may be 

 prepared by subliming sulphur with arsenic. It is 

 of a very bright yellow, but does not stand very 

 well ; and great caution should be used in employ- 

 ing it, as it is a strong poison. 



Naples yellow. This is a very durable and bright 

 pale yellow ; it comes from Naples, and is supposed 

 to be prepared from lead and antimony. 



Yellow ochre. This is an earth coloured by 

 oxyd of iron. It is a cheap colour, and not very 

 bright; but is valuable on account of its standing 

 well. 



Roman ochre, This is a superior kind of yellow 

 ochre. 



Dutch pink. This pigment is formed of chalk 

 coloured with the juice of French berries, or 

 other vegetables affording a yellow colour. It 

 does not stand, and is chiefly used for common 

 purposes. 



Gamboge is a gum brought from the East Indies. 

 It readily dissolves in water, and is a fine bright 

 yellow. It is used only in water, and is very 

 serviceable. 



Massicot is an oxyd of lead, prepared by calcin- 

 ing white-lead. It is very little used, the colour 

 not being very bright. 



Gall stones. This is a concretion or hard sub- 

 stance, formed in the gall-bladders of beasts 5 or it 



