Alternate Names: Arsenious oxide, Arsenic trioxide
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A white poisonous powder derived from the roasting of arsenopyrite (mispickel). It is available in dense large crystal form and a glassy form (made by heating under pressure).
The material can be used as a reagent in glass batches. Lumps thrown into the tank sink, vaporize, and rise sweeping away fine bubbles.
Because of its oxidizing effect, it can be used as a fining agent to clarify iron containing glass. It will also fade the color of manganese and stabilize other colors (i.e. light green). In pot glasses large quantities are used to reduce yellow coloration. Arsenic oxide is also used in specialized enamels (i.e. jewelry).
A major problem with the material is toxicity due to its vaporization on melting. This limits its use to tightly controlled environments.
Glaze Opacifier - White
It can be used as an opacifier in glazes, although not as effective as tin. It creates a fine matrix of bubbles that impede light passage.
Out Bound Links
The hazards of arsenic oxide in the ceramic processes
In Bound Links