I was just trying to see what the OED had to say about white in the sense of ‘reactionary’ (Metternich having talked about “white radicals” in 1834) when I was struck by the subentry for whiter than white ‘extremely white’ (“In mod. use popularized as an advertising slogan for Persil soap-powder”). After a nod at Shakespeare’s 1592 Ven. & Ad. 398 “Teaching the sheets a whiter hew then white,” the first citation is the following:
a1924 N.E.D. s.v. White sb. 23, Exceeding or surpassing white, ‘whiter than white’.
So wait, you get to use it yourself in the first edition, then quote that use as a citation in the second? I know, I know, the quotation marks imply the phrase was in current use, but it still makes my head spin.