animal charcoal การใช้

Animal charcoal or bone black is the carbonaceous glue and gelatin industries.
Wood charcoal also to some extent removes coloring material from solutions, but animal charcoal is generally more effective.
J . W . Laidlay examined fragments of the sandstone slab that had been donated to the Asiatic Society of Bengal by Colonel Butterworth and Lieutenant-Colonel James Low, strewing finely-powdered animal charcoal over the surface of the stones and sweeping it gently with a feather so as to fill up all the depressions; in this way " the very slightest of which was thus rendered remarkably distinct by the powerful contrast of colour.