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This scum is called glass-gall or sandiver, and is carefully removed with iron ladles.

This "slag" or "glassgallen" of Agricola was also termed sandiver.

Here the lump of sandiver lay, while through its mass shot rays of vivid prismatic color, glowing and dying along its surface so vivaciously that one needs must fancy the salamander no fable, and that this death of gorgeous agony was something more than the mere cooling of an inert mass of matter.