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Hi Les,
I had zeta puppis at B-V -0.27 rather than -2.7. Most of the other very hot stars seem to hover about that same value. I've not seen reference to any stars with a significantly more negative B-V.
On that basis, B-V seems a reasonable guide to the degree of visible blueness.
Thanks - I'll seek out Dunlop 94 for later.
Cheers
Andrew
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