ewre

Perhaps alternation of ore.

ewre (uncountable)

1. (rare) Rust; oxide.
   • 1634, Lowe, Chirurg.:

     By the continuall sorting and telling of this coyne, then did enter of the ewre of that brasse and copper under the nails of her fingers.

   • 1881, George Grant Francis, The Smelting of Copper in the Swansea District of South Wales:

     Wee are able to melt it w'th two fornises in the space of 40 weekes the quantitie of 560 tonne of ewre if wee might have it, and if the ewre be clean and well sorted the mor copper it will yeld.

• Ewer, ewer, rewe, we're, weer, were, were-