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% replaces any number of letters (la% - lake, lamp)_ replaces one letter (ca_ - car, cat)

Crossword clues for Smelting residue:

SLA: Smelting residue
SLAG: Smelting residue
SLAG: Smelt residue
DROSS: Smelting residue
SCORIA: Smelting residue
SPEISS: Smelting residue.
SLAG: Smelting residue (see what I did there?)
SLAGS: Smelting residues
SLAGS: Forms a residue when smelting ore