² tn Heb “I will purify your dross as [with] flux.” “Flux” refers here to minerals added to the metals in a furnace to prevent oxides from forming. For this interpretation of II בֹּר (bor), see HALOT 153 s.v. II בֹּר and 750 s.v. סִיג.

¹ tn Heb “The bellows blow fiercely; the lead is consumed by the fire.” The translation tries to clarify a metaphor involving ancient metallurgy. In the ancient refining process lead was added as a flux to remove impurities from silver ore in the process of oxidizing the lead. Jeremiah says that the lead has been used up and the impurities have not been removed. The translation is based on the recognition of an otherwise unused verb root meaning “blow” (נָחַר [nakhar]; cf. BDB 1123 s.v. I חָרַר and HALOT 651 s.v. נָחַר) and the Masoretes’ suggestion that the consonants מאשׁתם be read מֵאֵשׁ תַּם (meʾesh tam, “from fire it is consumed”) rather than as מֵאֶשָּׁתָם (meʾeshatam, “from their fire”) from an otherwise unattested noun אֶשָּׁה (ʾeshah).