Son of man, the house of Israel is to me become dross: all they are brass, and tin, and iron, and lead, in the midst of the furnace; they are even the dross of silver.
The house of Israel is to me become dross: all they are brass - Israel has become a worthless compound of the dross of silver (implying not merely corruption, but degeneracy from good to bad, Isaiah 1:22, especially offensive) and of the baser metals. Hence, the people must be thrown into the furnace of judgment, that the bad may be consumed and the good separated (Jeremiah 6:29-30).