IT is well known that most commercial forms of tin can be transformed to the grey (α) allotropic modification in an ordinary refrigerator by contact with particles of previously prepared grey tin.

There is no evidence, in fact, that tin has ever been observed to sinter 1. Tin powder is usua0lly made by the atomization of the molten metal and particles of the powder become coated with a film ...

The exact nature of his chemistry ... who had previously made the first steps towards identifying tungsten in tin ore. "Maybe Tycho Brahe had heard about this and thus knew of tungsten's existence ...