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Excellent sand

Burn alabaster in a crusol under charcoal fire until it turns into powder. Once it is cold, finely pulverise it through a sieve to make it impalpable. With a pound of alabaster, one should use an ounce of sal ammoniac. Mix well and incorporate everything together. Next, put it in a cave or a wet location. And with this paste, mold whatever you need and then dry the mold under a fire. While the sand is hot, you cast whatever metal you may like and your cast will be as neat as the principal. And the sand will always work if it is kept in a wet location and dried by the fire.