Word meanings
Strong's dictionary
the same as בֹּר; vegetable lye (from its cleansing); used as a soap forwashing, or a flux formetals; [idiom] never so, purely.
Strong's Exhaustive Concordance (public domain)
Full lexicon entry (Brown-Driver-Briggs)
בֹּר n.m. lye, potash, alkali used in smelting metals Is 1:25
Every occurrence
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Isaiah 1:25 כַּבֹּ֖ר ka.Bor · A person, place or thing
and I will turn my hand upon thee, and thoroughly purge away thy dross, and will take away all thy tin;
American Standard Version (1901). Public domain.