Manufacturer and builder 2, 1870
J. G. E., of New-York.
You can not give a gold color to cast-iron by first coating it with tin, and then using a suitable lacker, (as a contemporary advises you to do,) for the simple reason that it is not practically possible to coat cast-iron with tin. Wrought-iron and steel may be easily tinned, not cast-iron. It is also bad advice to mix bronze-powder in the varnish. The true method is to put on the paiat or varnish first, and dust the bronze-powder over it.
T. B., of Connecticut
The liquid colors now found extensively in the market, and sold in small bottles, either as ink or for coloring photographs, are mostly aniline colors. Some are bright and others of a dirty color; those of the latter quality are the least desirable of all coloring materials, of what-ever kind.
Manufacturer and builder 2, 1870
H. P., of New-Jersey.
The best test for Prussian blue is that lately discovered by Nickles, namely, fluoride of potassium; which bleaches this, while it does not affect other similar colors, such as indigo, blue aniline, etc.
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