Permanent Colours of Gpake Bodies, 193 



differ from the change eftedted in flowers by the 

 fame vapour. ♦ 



1 he light of the fun is found to be a neceflary, 

 and effential, agent in bleaching linen, bees' wax, 

 and various other fubftances. Some part of the 

 colouring matter, which impairs the whitenefs of 

 fuch bodies, not yielding to the power of any 

 other folvent. 



Red flowers are whitened by the eledric fpark, 

 of whofe inflammable nature we cannot entertain 

 the leafl: doubt. For the fpark itfelf is a bright 

 flame, and it yields the fame fmell, which all 

 other phlogiftic matters impart. 



The eleftric fpark, in like manner changes the 

 blue infufion ofturnfol, to red. The efFeds which 

 it produces on the turnfol, and on red flov/ers, do 

 not difi^er from each other, except in degree only; 

 For, when vegetable matter is diflTolved, it is 

 changed from blue, to red ; and when it is farther 

 diflTolved, it is divided into particles too minute 

 to exhibit any colour. 



A due attention to the changes of colour, and 

 other efi'edls, arifing from the folvent power of 

 phlogifton, will afford much infight into feveral 

 operations of the arts and manufadlures, and will 

 furnilh an explanation of many appearances, wKic^ 

 occur in chymiftry, and phyfics, which cannQt 

 otherwife be rightly underfl:ood. 



The pcrfedion of the arts of dying, and bleach- 

 ing, and of preparing and preferving painters* 



Vol. II. O colours. 



