ON WHITE LEAD. 
83 
where the only object is the manufacture of white lead; they 
ought to be connected with other chemical manufactures, the 
various processes of which should be " dovetailed" into each 
other, so that collateral products may be wrought up to other 
products of great utility in the arts. I have not yet seen a 
good analysis of white lead made by these chemical processes, 
but from my own experiments I believe it will prove to be like 
the others, a mixture of hydrate and carbonate, for upon pre- 
cipitating concentrated solutions of carbonate of soda and 
acetate of lead, carbonic acid is uniformly generated, and 
escapes with slight effervescence. With a pure basic acetate 
this does not take place, because the carbonic acid which 
would have escaped unites with the soda. The decomposi- 
tions may be thus illustrated. 
Carbonate of 
soda, 
Neutr, acet. of 
lead. 
Carbonate of 
soda, 
Basic acet. of 
lead 
So that in either case a basic carbonate of lead results, the 
excess of oxide uniting with a proportion of water to form a 
hydrate. It would, therefore, appear that the white lead thus 
produced is similar to that resulting from Thenard's principle, 
under all its modifications. Whether it forms as good a pig- 
ment as that produced by the older processes I cannot deter- 
mine, having never heard the results of its application. 
Conclusion. — Mulder, (before quoted Bullet, d. Sci. &c, in 
Neerlande L, p. 302,) examined a white lead made by a pro- 
cess lately patented by Stratingh, and found it to consist of 
three atoms of carbonate, and one of hydrate. This method 
of manufacture, which I have not seen described, has a decided 
advantage over others, by its not becoming yellow in a 
CO 2 
Carbonic acid. 
2C 2 
Basic carbonate of lead. 
3NaO 
Acetate of soda. 
3A 
Acetate of soda. 
3P6 
Basic carbonate of lead* 
C 0* 
Acet. and carb. of soda. 
2C 2 
Basic carb. of lead. 
3N«0 
Acet. and carb. of soda. 
2A 
Acet. and carb. of soda. 
3P6 
Basic carb. of lead. 
