Permanent Colours of Opake Bodhs, 18 i 



unaltered in texcgre, and in every other rt^^t^^ 

 except in their lofs of colour. 



.In this ftate, they confift principally of the 

 fibrous and vafcular parcs^ and are either perfe(5Hy 

 white, or have their wMtcnefj S\^\o\x\\y tinged with 

 •brown. 



I digefled alfojn redified fpirit of wine, red, 



.purple and blue flowers, All thefe yielded, to 



•the fpirit, thejr . colouring matter, and by the 



deprivation of it appeared white. ,From moft of 



thefe flowers, the fpirituous menRruum acquired 



either no colour, or only a faint tinge. But, 



when it was acidulated, it became red, and^ 



by the addition of an alcali, aHumed purple, 



bJpe, and greep,. colours. In each of thefe 



dates, the coloured tindtures were examined in 



^e vials, as in (No. 21, 24, 25.) and, alfo were 



^ured upon a white ground. All of them, 



cby thefe means,, were found to yield brio-hc 



colours by tranlmi:fijon, hut none of them refled- 



cd any light. 



■ 1 alfo digelled red, purple and blue flowers, 

 in water flightly acidulated with nitrous acid, 

 and thus obtained from them red infufions, 

 which I have been able to prefervl many years, 

 -without the lead alteration in their colour, by 

 faturating them with fea-falt. (No. 22, 23.) 



By the addition of very fmall portions of al- 

 cali, thefe red liquors alfo were changed to purple, 

 blue, and green. All thefe coloured infufions 



N 3 were 



