Page "Amber" Paragraph 21

Pieces of amber torn from the seafloor are cast up by the waves, and collected by hand, dredging, or diving.

Elsewhere, amber is mined, both in open works and underground galleries.

Then nodules of blue earth have to be removed and an opaque crust must be cleaned off, which can be done in revolving barrels containing sand and water.

Erosion removes this crust from sea-worn amber.