A word appearing as ᴱQ. tambina “of copper” in the Qenya Lexicon of the 1910s, adjectival form of ᴱQ. tambe “copper, bronze” under the early root ᴱ√KALA “shine golden” (QL/44).
Neo-Quenya: Since I use ᴺQ. tambë only for “bronze” for purposes of Neo-Quenya, I would use ᴺQ. tambina as “of bronze” while for “of copper” I would use ᴺQ. urusta.
A noun appearing as ᴱQ. tambin (tambind-) in the Qenya Lexicon of the 1910s somewhat cryptically glossed “a copper or cauldron”, derived from the early root ᴱ√TAMA “beat; smelt, forge” (QL/88). It also appeared in the Poetic and Mythological Words of Eldarissa of the same period, with the more straightforward gloss “cauldron” (PME/88).
Neo-Quenya: The root √TAM appeared in Tolkien’s later writing in connection to craft words, so I would retain this word as ᴺQ. tambin “cauldron” for purposes of Neo-Quenya.