Järna Tvåleri possesses the magical knowledge (saponification!) of turning old used cooking oil into first-class new soap! Soap made from 100% rapeseed oil is incredibly mild and caring, but does not lather as much.
Right now I have a collaboration with Kulturmat at Kulturhuset in Ytterjärna, where I reuse their used organic rapeseed oil to make new rapeseed soap. But I'm looking for more oil to saponify into soap - so please let me know with tips!