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Varnish made exactly as before, but observe, that those who make lackers frequently want some paler and some darker and sometimes inclining more to the particular tint of certain of the component ingredients; therefore if a 4 oz. vial of a strong solution of each ingredient be prepared, a lacker of any tint can be prepared at any time as by changing varnish.
The painter is guided by these trial pieces in laying on his colours. To fire the paintings a furnace with a muffle is used. The muffles are made of refractory clay. This coating is preferable to any glue or cement for coating picture frames, &c., on which is to be laid the tin or silver leaf, to be varnished with gold varnishes or lackers.
After the distillation of benzene from the crude coal-naphtha is completed, the chief impurities in the residue are charred and deposited by the action of strong sulphuric acid. By further distillation a lighter oil is given off, often known as artificial turpentine oil, which is used as a solvent for varnishes and lackers.
As it was, some acres were born large and some small, some fruitful and some barren, some with gold in their mouths and some with only the taste of alkali; and only an infinite wisdom could have adjusted them to the unequal capacities of that army of land lackers who declared themselves free and equal, and who, with free-soil banners, advanced to the territory where the squatters became sovereigns and homesteads became castles.
Changing varnishes may likewise be employed, with very good effect, for furniture, such as picture frames, &c. See Lackers.
In using the changing varnish or any of these lackers, for picture frames for instance, lay them over with tin or silver leaf, by means of plaster of Paris glue, or cement of some kind, that the foil may be perfectly adherent to the wood, then apply your varnish; apply as many coats as may suit your taste, and if it be the gold lacker you use it has the appearance of being laid with gold leaf, and if the pale brass lacker, of being laid with brass, &c., and if you use the changing varnish you may make it just what colour you wish, by mixing the three materials in different proportions.
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