Permanent Colours of Opake Bodies, 163 



As the incapacity of the Colouring Particles of 

 Tranfparent Bodies to refled light, is deduced 

 from experiments which are very numerous, and 

 whofe refults are conftant and invariable, it may 

 be held as a general law, at leaft till fome excep- 

 tion to it can be difcovered. 



This law will appear (till more extenfive, if 

 it be confidered that, for the moft part, the ting- 

 ing Particles of liquors, or other Tranfparent 

 Subftances, are extracted from Opake Bodies ; 

 that the Opake Bodies owe their colours to thofe 

 particles in like manner as the Tranfparent Sub- 

 fiances do, and that by the lofs of them, they are 

 deprived of their colours. 



By experiments made with feveral Opake Bo- 

 dies, it will be fhewn that they atSlually do not 

 exhibit their colours, by reflefting the rays of 

 light. And, by the fame experiments, the means, 

 by which they do produce their colours, will be 

 hereafter explained. 



For the purpofe of obferving the manner in 

 which Tranfparent Coloured Liquors a£l upon the 



word to evprefs only the primary colours, or fuch a mixture 

 of them, as does not compofe whicenefs, or any of the gra- 

 dations between white and black ; fuch as are called by Sir 

 Ifaac Newton, grey, dun, or rufiet brown. 



M 2 



rays 



