EMBOSSING ON GLASS.

Western Star, Issue 1540, 28 February 1891, Page 1 (Supplement)

EMBOSSING ON GLASS.

Mark off the lettering on paper, and place it under the glass. Then with Brunswick black and a fine brush go over the glass, covering all except where the lettering has to appear. Let it harden, which will take about 21 hours. Examine carefully to see that there are no pin-holes, which must be carefully stopped. Clean the glass so that it is perfectly clean from grease, not touching it even with the fingers. Build a small ledge around the glass of lard, and plr.ce the article on a perfectly level table out of doors. Pour a sufficient quantity of fluoric acid (which may be obtained of most chemists) to cover the glass. A dangerously corrosive fume is given off, which would be injurous to breathe, hence the need of working in the open air. From 5 to 15 minutes may bo required in etching the glass, depending on the strength of the acid._ To determine the exact time, experiment oa a piece of glass first. When the etching has been carried far enough, pour off the acid, wash well the glass, and remove tbe black. If coloured letters are required, then choose flashed glass of the colour desired. ' aint the letters with 8.8 , and treat as before, biting down to the plain glass. If we desire embossed letters on ground glass, proceed as before, biting the letters, &c., fairly deep. The “ ground ” must ; be produced by rubbing the surfa e with smooth iron. Any degree of fineness may bo obtained by using various numbers of emery. As to the names of the makers of lamp glasses embossed on tbe chimneys, I presume it is done by the sand blast; at anyrato, it has such an appearance to me. —From Work.