to 40 pounds. natural gas. This is admitted at each end of the fur- an opaque glass. The assayer frees his metal from the It is at the final dip that the gatherer’s greatest skill accompanying gangue by adding suitable fluxes until nace, and is mixed with air which has been heated by is called into… … pounds of arsenious acid are added. This acts as a bleaching agent, and by converting the iron present into a higher oxide, re- moves the color to a large extent. At some establish- ments peroxide of mangan- ese is used for this purpose, but a slight excess will give a pinkish color, and it also…
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