OCR Text |
Show Venetian Mirrors. The beauty md almost absolute perfection per-fection characterizing the mirrors produced pro-duced in the manufactories of Venice are mainly due, it is said, to the peculiar pecul-iar solution applied to the surface. Pre liminary to this application the glass is thoroughly cleaned with wet whiting, then washed with distilled water and prepared for the silver with a sensitizing sensitiz-ing solution of tin, which is well rinsei off immediately before its removal to the silvering table, and the latter being be-ing raised to the proper temperature the glass is laid and the silvering solution solu-tion at once poured over it before the heat of the table has time to dry any part of the surface of the glass. Ths solution so-lution used is prepared as follows: la one-half litei of distilled water 100 grains of nitrate of silver are dissolved, to this being added 62 grains of liquid ammonia of 0.88 specific gravity. The mixture is filtered and made up to eight liters with distilled water, and 7 5-10 grams of tartaric acid dissolved in 30 grams of water are mixed with the solution. so-lution. About 2 5-10 liters are poured over the glass meter to be silvered, the metal immediately commencing to deposit de-posit on the glass, which is maintained at about 104 degrees F., and in a little more than a half hour a continuous coating coat-ing of silvev is formed. After carefqi wiping witl chamois the surface is treated a second time with a solution like the first, but containing a doubl quantity of taxtario acid. New York Son. |