The whitening is done by boiling the pins in a large copper kettle, which also contains layers of grained tin and a solution of argol or bitartrate of potash. 佚名.神奇的知识之书.
I was encouraged by nothing, mother, but by looking at the red sparks dropping out of the fire, and whitening and dying. 查尔斯·狄更斯.艰难时事.
A general whitening of the skin is produced by this lotion without any irritation. 威廉K.戴维.智者、化学家和伟大医生的秘密.