from The Century Dictionary and Cyclopedia
- n. In soap-making, the watery solution which settles out on graining the soap with salt. It contains the glycerin and organic impurities which are the products of the stock saponified.
Sorry, no etymologies found.
None of these colors gives the characteristic reaction with milk of lime and boiling soap-lye.
A boiling soap-lye restores the original red, though somewhat paler.
"If only your soap-lye was half as sharp as your tongue!"