xà phòng
QUÁ TRÌNH XÀ PHÒNG HÓA
Soap can be made from fats and oils, sodium hydroxide, and water. Soapmaking can be as simple as dissolving sodium hydroxide in water, melting fats together, adding the sodium hydroxide solution (lye) to the melted fats, and stirring. It can get more complicated, but it needn’t. This book starts at the beginning, assuming the reader …