An Account of, ec. oe] 
An Account of, and Obfervations on, d'fferent Buut 
Coxours, produced from the Mother Water of S.da 
Phofphorata, ©c. by Mr. Tuomas Wits, of 
Lonvon. — Cemmunicated by ‘Tuomas Henry, 
F. R. S. &e. 
ET 
To Mr. THOMAS HENRY. 
Sir, 
I requeft the favour of you, to lay 
before the Society the inclofed Paper (contain- 
ing an Account of, and Obfervations on different 
blue Colours, produced from the Mother-waters 
of Soda Phofphorata) for their infpection, and 
fhall be much honoured if it fhould merit their 
approbation. 
The colour No. 1, feems to be a fort of Pruffian 
blue, but is much clofer in its texture, and on 
breaking it, appears fomewhat gloffy. 
As three of thefe colours are in the hands of 
different Painters, fhould they prove ufeful, I 
fhall take the earlieft opportunity of communicating 
the intelligence to the Society. 
Iam, Sir, 
Your moft obliged and obedt. fervant, 
April 12, 1791. THOs, WILLIS. 
