Elements of chemistry : including the applications of the science in the arts . at the point c, where there is an excess of atmospheric air. To produce the colourof the protoxide, we expose to the reducing flame; and to produce the colour of theperoxide, we expose to the oxidizing flame. As pieces of metal could not be soldered together if covered by oxide, borax isfused with the solder upon the surface of the metals to be joined, to remove theoxide. Borax is also a constituent of the soft glass, known as jewellers paste, whichis coloured to imitate precious stones. But the most considerable c
Elements of chemistry : including the applications of the science in the arts . at the point c, where there is an excess of atmospheric air. To produce the colourof the protoxide, we expose to the reducing flame; and to produce the colour of theperoxide, we expose to the oxidizing flame. As pieces of metal could not be soldered together if covered by oxide, borax isfused with the solder upon the surface of the metals to be joined, to remove theoxide. Borax is also a constituent of the soft glass, known as jewellers paste, whichis coloured to imitate precious stones. But the most considerable consumption ofthis salt is in the potteries, in the formation of a glaze for porcelain. A neutral borate of soda is formed by calcining strongly 1 eq. of borax with 1eq. of carbonate of soda, when carbonic acid is expelled. The solution yields a saltbelonging to the oblique prismatic system, of which the formula is, + heated, it fuses in its water of crystallization, and is expanded into a vesicularmass of extraordinary magnitude by the vaporization of that w
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