Finely divided vegetable charcoal added to a soda-lime glass gives a yellow colour.
The arseniuretted hydrogen produced is passed through a tube containing lead acetate paper and soda-lime, and finally through a narrow glass tube, constricted at various points, and heated by a very small flame.
- The varieties of glass used for the manufacture of table-ware and vases are the potash-lead glass, the soda-lime glass and the potash-lime glass.
An analysis of the glass of a Cairene mosque lamp shows that it is a soda-lime glass and contains as much as 4% of magnesia.
The increase in weight of the potash bulbs and soda-lime tube gives the weight of carbon dioxide evolved.