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French Plate Glass
White quartz sand and cullet (old glass), of each slacked lime, 43 parts. Or: Pure sand, 72 300 parts ; dry carbonate of soda, 100 parts; parts; parts; refined soda; 45 parts; quicklime, 48 nitre, 24 parts; cullet (old glass), 45 Pure sand, 40 parts. 2352. Table of Proportions of the Materials Used for Making Lead Glass, the Numbers Increasing with the Quality.
Crystal.
Common Flint.
Optical.
Paste to imitate Diamonds, &c. 1. 2. 3. 4. 5. 6. 7. 8.
Y. 10. 11. 12. 13.
Silica.
Oxide of Lead. 100 100 100 10 30 42 45 100 100 48 66 70 80 to 85 100 100 133 154 160 Potash, purified.
Saltpetre.....
Carbonate of Lime Borax. 35 33 33 35 16 26 40 35 to 40 23 23 13 56 20 10 15 7 32 to 3 1.3 20 13 8 6.3 It has been suggested that the oxide, or other salt of thallium, substituted for the lead, makes a paste of greater brilliancy and dispowers for optical purposes, and for imitation gems. 2353. Ingredients for Coloring Paste to Imitate Gems. The following propor- Imitate Gems. The following proportions must be added to 1000 parts of paste No. 12 in the above cable of lead glass.