OCR Text |
Show Venetian Mirrors. The beauty and almost absolute perfection per-fection characterizing the mirrors produced pro-duced in the manufactories of Venice tie mainly due, it is said, to the peculiar pecul-iar solution applied to the surface. Preliminary 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 cf tiaj which is well rinse J off immediately before its removal to the silvering table, and the latter bo-Ing bo-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 ass follows: Ii one-half liter 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 80 grams of water are mixed with the solution. so-lution. About 2 8-10 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 silvci is formed. After careful wiping witl chamois the surface ii treated a second time with a solution like the first, but containing a doubls quantity of tartaric acid. New York Sun, |