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| Original ampullae are usually made of lead. These are made of pure tin.
To produce these ampullae, a mold with a large cavity is
filled up entirely with molten metal, then as the metal starts to freeze from the outside first, the still
molten center of the pool is poured back out, leaving a hollow shell. Lead and tin both
have rather small ranges of temperature between really molten and really solid, so they
can be used in this "slush casting." Other metals and alloys have a longer period between phases,
during which the metal is grainy and sticky - these metals slush cast very poorly.
P-16 Large Ampulla $7.00 |