Soap manufacturing industry
|Title||Soap manufacturing industry|
|Place made||Singapore: Changi|
|Medium||brush and ink and wash on paper|
|Measurement||Overall: 18.4 x 27.1 cm (irregular)|
Depicting three of the various stages of soap making in the Changi prisoner-of-war camp, by prisoners with improvised equipment. Extreme left; many washings of wood ash to produce potassium carbonate. Centre; Potassium carbonate boiled with lime to produce caustic potash. Right; Evaporated to make a strong solution.