blue soap, noun phrase
- Origin:
- Shortened form of blue mottled soap.
A coarse, hard, blue-marbled soap used in both kitchen and laundry, made by stirring a mixture of washing blue, caustic soda, and starch into the cooling soap; blue mottled.
- Note:
- Originally made from animal fat and plant lye. See also ganna.
1956 A. La Guma in New Age 27 Sept. 6Once a week is washing day. A scrap of hard blue soap and a scrubbing brush are issued, and everybody gets down at the ditch across the middle of the yard to do their clothes.
1988 A. Dangor in Bunn & Taylor From S. Afr. 198She had long ago stopped using the harsh, carbolic-based Blue soap so commonly used in the township.
A coarse, hard, blue-marbled soap used in both kitchen and laundry, made by stirring a mixture of washing blue, caustic soda, and starch into the cooling soap; blue mottled.

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