Logwood

(noun.) spiny shrub or small tree of Central America and West Indies having bipinnate leaves and racemes of small bright yellow flowers and yielding a hard brown or brownish-red heartwood used in preparing a black dye.

(noun.) very hard brown to brownish-red heartwood of a logwood tree; used in preparing a purplish red dye.

乔安妮手打

• A good black ink can be made by boiling 3 pounds of logwood with sufficient water to leave a residue of 5 quarts. 威廉K.戴维. 智者、化学家和伟大医生的秘密.
• Boil the logwood for 30 minutes in a gallon of water, and then add the copperas and lampblack. 威廉K.戴维. 智者、化学家和伟大医生的秘密.
• Boil the logwood with the water, add the acid and potash, and lastly the dextrine. 威廉K.戴维. 智者、化学家和伟大医生的秘密.
• For example, with alum and oxalic acid as a mordant and logwood as a dye, blue is obtained; but with a mordant of ferric sulphate and a dye of logwood, blacks and grays result. 伯莎M.克拉克. 科学通论.

录入:劳伦斯