Slag

Meaning

Slag names what is separated and thrown away as impure or unsuitable in the later account of tinging metals. The contrast is with material sufficiently pure and related to receive the tincture readily. The word is therefore part of the passage’s explanation of differential receptivity and rejected remainder, not a name for the starting matter or a further desired product. The English’s “as slag” retains the comparative formulation. The entry does not specify a modern slag composition, and the promised multiplication associated with the passage remains the author’s claim rather than an independently verified result.