Frank Krygowski wrote:

In my kitchen, I find that knives are
magnetic. They're almost certainly
martensitic stainless steel, which can
be hardened.

martensitic stainless steel, magnetic, can be
hardened with heat treatment

Our measuring cups and measuring spoons are
non-magnetic, which means they're
probably austenitic.

austenitic ditto, non-magnetic, cannot be
hardened

Also, obviously, aluminum is noticeably less
dense. Unless it's anodized, it's also softer
(i.e. easier to scratch).

anodize, to put on an oxide coating on
aluminium

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underground experts united
http://user.it.uu.se/~embe8573