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Originally Posted by ballaratdragons
Cheaper mirrors are made of Plate Glass which is easy to recognise by it's green tinge (in the glass, not in the reflective aluminium coating).
BK7 is a higher grade 'optical glass' used worlwide as a very good mirror material and a lower thermal co-efficient to plate glass (quicker cooling) and does not have the green tinge to it, it is clear. It is a very good quality Glass.
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As far as mirrors go, BK7 is hardly better than plate glass. Its light transmission characteristics are better but that is irrelevant for a mirror. Its thermal characteristics are only a bit better.