Tannin

(noun.) any of various complex phenolic substances of plant origin; used in tanning and in medicine.

编辑:梅根

• Melt the petrolatum and wax together and add the tannin while cooling; add the oils and stir until cold. 威廉K.戴维. 智者、化学家和伟大医生的秘密.
• The oak, fir, hemlock and sumach are the most familiar of the many trees from which tannin is obtained for this purpose. 佚名. 神奇的知识之书.

整理:纳撒尼尔