Having compared them over the past few years I still contend that, as adults, a pure white BlkEL is cleaner than any of the BluELs. Every adult of the latter that I have seen has always had a very slight yellow tint to it, making them look more cream-coloured than white.
And, as was noted, the all white Pied variants (LesserPied, BluEL Pied, WhiteWedding, etc.) also tend to stay shock white
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