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Edge of petals is not straight but with "cut" edge + seems some discoloration on petals, too.Janis
But that could equally be normal cultivational damage and the light the picture was taken in couldn't it?
Very interesting the discussion over Crocus cartwrightianus 'Albus' hort.Here seedlings from this form, around 50 % have pale blue flowers like cartwrightianus, other plants pure white.I think, this is a cross between hadriaticus and cartwrightianus.