f)5 MR. HATCHETT S EXPERIMENTS 



Colouring ex- 5. Water, when digefled with it in a boiling heat, partially 

 diflblves it ; but the refiduum was found to be abfolutely in- 

 foluble in water. 



4. Alcohol a£ts but flowly on it ; and, in a digefting heat, 

 diflblves lefs than water. The colour of the folution is alfo not 

 fo beautiful ; and a confiderable part of the refiduum left by 

 alcohol was, when digefled with water, found to be foluble, 

 although this was not the cafe, when the refiduum left by water 

 was treated with alcohol. 



5. It is infoluble in fulphiiric ether, excepting a very fmall 

 portion of refin, which appeared to be accidentally mixe^. 

 with it. 



6. Sulphuric acid readHy diffolves it, and forms a deep 

 brownifh-red folution, which, being diluted with water, and 

 Saturated with potafh, foda, or ammonia, becomes changed to 

 a deep reddifh-purple. 



7. Muriatic acid diffolves only a part : the folution is of the 

 colour of port-wine, and, by the alkalis, is changed to a deep 

 reddifh-purple. 



8. Nitric acid fpeedily diffolves it: the folution is yellow, 

 and rather turbid; but the red colour is not reftored by the 

 alkalis, for thefe only deepen the yellow colour. This nitric 

 folution did not afford any trace of oxalic acid. 



9. Acetic acid diffolves it with great eafe, and forms a deep 

 brownifh-red folution. 



10. Acetous acid does not diffolve it quite fo readily, but 

 the folution is of a brighter red. Both of the above, when 

 faturated with alkalis, are changed to a deep reddifh- 

 purple. 



11. The lixivia of potafh, foda, and ammonia, a6t power- 

 fully on this fubftance, and almoft immediately form perfect 

 folutions, of a beautiful deep purple colour. 



12. Pure alumina, put into the aqueous folution, does 

 not immediately produce any effect; but, upon the addition 

 of a few drops of muriatic acid, the colouring matter fpee- 

 dily combines with the alumina, and a beautiful lake is 

 formed. 



1 3. Muriate of tin produces a fine crimfon precipitate, when 

 added to the aqueous folution. 



1 4. A fimilar coloured precipitate is alfo formed, by the addi- 

 tion of folution of ifinglafs. 



2 Thefe 



