Lead glass, such as lead crystal or flint glass, is more 'brilliant' because the increased refractive index causes noticeably more "sparkles", while boron may be added to change the thermal and electrical properties, as in Pyrex.
Ultrasonic and steam alone may not do it all no matter how long you soak the piece so try this: Using a deep pyrex dish, add some water and a small amount of Draino drain cleaner and pop the hollow chain in.
One simmers a concentrated solution of alum and a broken drill bit embedded in a piece turns to brown dust and dissolves out in about twenty minutes. Use a Pyrex® or Corning® type container - not a steel pot for obvious reasons.
A piercing in males on the inferior anterior abdominal wall, usually just superior to the penis.
Pyrex: A kind of glass that is heat and chemical resistant. It can be autoclaved. It is used in large gauge jewelry, such as plugs.
 See also: Water, Stone, Table, Make, Point
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