They still, however, are commercially successful.
It is known commercially as neutral red.
Liebermann in 1868 prepared that substance synthetically from anthracene, but their process was not practicable on a large scale, and it was left to him to patent a method that was commercially valuable.
Benzene is of exceptional importance commercially on account of the many compounds derivable from it, which are exceedingly valuable in the arts.
There is no feasible method at present known of preventing the inclusion of the resin of the latex with the rubber during coagulation, and although the separation of the resin from the solid caoutchouc by means of solvents is possible, it is not practicable or profitable commercially.