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Another (Take parts of white glass part)

Take 4 parts of white glass, 1 part of antimony, 3 parts of red-lead, and 1 part of iron scales. Fuse the mixture.

Another. Take 16 parts of flints, 1 part of filings of iron, and 24 parts of litharge. Fuse the mixture.

Lemon-colored Glazing.

Take of red-lead, 3 parts; of powdered bricks, very red, 34 parts; and of antimony, 1 part. Calcine the mixture day and night, for the space of 4 days, in the ash-hole of a glass-house furnace.

Urge it at last to fusion, and it will produce a very fine lemon-colored glazing.

The success of this operation depends greatly on the fineness of the color of the bricks that are powdered. Those which are of a fine red and very brittle, are the best; but such as are gray will not at all answer the end. The same attention should be paid to this matter wherever bricks are used in this kind of preparations.

Light Yellow Glazing.

Take of red-lead, 4 parts; of antimony, 3 parts; of the mixture of the calxes of lead and tin, before mentioned in the masticot for white glazing, 8 parts; and of glass, 3 parts.

When the red-lead and calx of tin are used, the proportion of the ingredients will be of red-lead, 10 parts; of antimony and glass, each, 3 parts; and of calcined tin, 2 parts. the whole, and proceed in the manner stated above.

Violet-blue Glazing.

Take 12 parts of tartar and an equal quantity of flints and zaffre. Proceed as with the above.

Another. Take 4 oz. of tartar, 2 oz. of red-lead, 5 oz. of powdered flints, and dr. of magnesia.

Proceed as with the above.

Fine Red Glazing.

Take 3 lbs. of antimony, 3 lbs. of red-lead, and 1 lb. of colcothar. Grind the whole as fine as possible, and then paint with it.

Another. Take 2 lbs. of antimony, 3 lbs. of redlead, and 1 lb. of colcothar. Proceed as with the above.

To Prepare Varnish for Pottery Ware, free from Lead.

Melt and keep in fusion for 14 minutes a mixture of 1 oz. of fire-stone and glass, 2 drs. of salt, the pots over with this matter, after they have been oz. of pipe-clay, and 14 oz. of borax.

Varnish hours. in the fire, and put them again in it for about 18 Varnish for Earthenware. glass and soda, finely pulverized, carefully sifted, This varnish is made of equal parts of white and mixed.

Chinese Mode of Glazing China. treat them as before mentioned, by pounding and They take the finest pieces of the petunse and washing over, but extract, by repeated washings, keeps so moist with the water that the mixture over, the very finest part of the powder, which forms a liquid mass, which they call the oil of petunse. With this oil they mix an equal weight of borax; they then slake a quantity of quicklime and form layers of that and dried furze, which they set on fire. When they have raised a large heap, after the first one is burnt to ashes, they collect them and the lime, and form layers of them again, with a fresh quantity of the furze, which they burn as before, and they repeat this 5 or 6 Any preparation of the calcined iron may be times. They then put the ashes and lime into a used in the place of the colcothar: and the re-vessel with water, adding some borax in the pro- Gold-colored Glazing.

Take of red-lead, 3 parts; of antimony, 2 parts; of colcothar, 1 part. Fuse the mixture; and, having powdered the mass, melt it again, and repeat this operation till the fourth time, and a fine gold-colored yellow will be produced. portion of 1 lb. to 1 cwt. of the ashes; they next | ing, melting otherwise again, in the burning in wash over the finer part of this mixture, and pour off at last all fluid from the dregs, which they keep together with the solid part, washed over.

They mix this composition of lime, ashes, and salts with the mixture above mentioned, of an equal quantity of the oil of petunse and borax, and this compound forms the matter for glazing the ware.

Instead of the petunse, the quartz used in the Saxon manufacture may be employed for forming a similar glazing, by treating it in the same manner; and it is said the glazing of the Dresden China is actually made in this way.

English Glazing for China.

Take of the finest white sand, or calcined flints, 20 lbs.; red-lead, 18 lbs.; pearlash, 10 lbs.; and common salt, decrepitated, 4 lbs. Levigate the sand or calcined flints and red-lead well together, and afterwards mix them thoroughly with the pearlash and common salt. Fuse the compound in the manner directed for the treatment of glass, till it be perfectly vitrified; then separate the fragments of the pot carefully from it, and reduce it in a flat agate or porphyry mortar to an impalpable powder. Finally, temper it with water to the proper consistence for painting or glazing.

Modification of the above. of the colors would become too fluid, and spread them so as to take away the effect of the fine touches.

To apply, on every kind of Ware, Colors which produce Herborizations. Herborizations can be of all colors; but the most agreeable is that called bistre, which is composed in the following manner: A pound of calcined manganese, 6 oz. of burntiron straw or 1 lb. of iron ore, and 3 oz. of flint powder.

The manganese and straw or iron ore must be pounded separately in a mortar, after which the whole is calcined together in an earthen pot. This mixture, thus prepared, is all pounded together, and then mixed in a small tub of water.

The blue, green, and other colors must be composed of the divers substances known to produce them, and mixed, calcined, and pounded in the same manner as for the bistres.

To make the application of these various colors to the pieces it is necessary, instead of diluting them with water, as is practised for ordinary painting, to make use of any kind of mordant.

The most advantageous, and which are employed with the greatest success, are urine, and the essence of tobacco. When this glazing is used for embossed or other fine work it should be mixed with a third of its weight of the spar of lead, or other vitrescent earth, in lieu of the petunse, in the composition of the ware paste. Take care that this earth is formed of the best pieces of spar or other substance used, and that it is rendered to an extreme fineness, by washing it over. The design of this addition is to weaken the fluxing powder of the glaze, which, if used alone, would run the corners and edges of the smaller part and impair the sharpness and spirit of the work. It is necessary to pursue the same method with pieces that are to be painted with more delicate designs; for the glaz- | charged his brush with colors. If the essence of tobacco is made use of, infuse 2 oz. of good tobacco, in leaves, during 12 hours, in a bottle of cold water, or very simply infuse the 2 oz. of tobacco in a bottle of hot water.

The pieces of clay, after taking a little corsistency, are steeped in white or colored wormseed until the bath puts them in a state of moisture.

To produce herborizations it will be sufficient, whilst the wormseed is still fresh, and at the moment when the piece is taken down from the tub to lay on slightly, and with a brush, one or several, drops of other colors. Each drop produces a tree more or less great, according as the workman has To Manufacture Glass.