Fromblue +‎-en.

bluen (third-person singular simple presentbluens,present participlebluening,simple past and past participlebluened)

1. (ambitransitive) Tomake orbecomeblue.

   Synonym:blue(verb)

   • 1991, Andrey Bely,The Christened Chinaman, page95:

     Here the minutes ticked off, they weaken with the hardly noticeable dawn; I see: the black ink — hasbluened; and I know: —[…]

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