In Chaoshan dialect, medicine C refers to washing powder. White acrylic medicine is washing powder. There is also a medicine called black proprietor, which is different. It is a powdery object, which looks like brown sugar and is alkaline. Can be used to wash hair, dilute and treat some skin diseases, and has a miraculous effect on mosquito bites and prickly heat. This black-and-white medicine is also used to make zongzi in Chaoshan area.