As boracic acid is but slightly soluble in water and other common solvents this combination with glycerine--which is also a useful agent in arresting the growth of germs--is peculiarly valuable. 威廉K.戴维.智者、化学家和伟大医生的秘密.
By thus manipulating the various solvents you will be enabled probably to separate the crude asphalt into several distinct hydrocarbons. 弗兰克·刘易斯·戴尔.爱迪生的生平和发明.
After you can go no further, distil off all the solvents so the asphalt material has a tar-like consistency. 弗兰克·刘易斯·戴尔.爱迪生的生平和发明.