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They aren't unique, like platinum or titanium (6)

Ross

I believe the answer is:

alloys

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'they' is the definition.
Both the definition and answer are plural nouns.
Perhaps there's an association between them I don't understand?

I can't explain the remainder of the clue.

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(Other definitions for alloys that I've seen before include "Blends of metals" , "Tempers" , "Puts down" , "Metals formed from mixtures of other metals" .)

I've seen this clue in the Evening Standard.
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