Scientists engaged in chemical research are known as chemists. It is explored by philosophers, chemists, and philosopher-chemist teams. Materials scientists and metallurgists share much of the same education and skills with chemists. Hydrochloric acid was known to alchemists and early chemists. Thus, they continue to enjoy widespread use by chemists and chemistry educators. Bachmann has expressed support for immigration of highly skilled professionals such as chemists and engineers. And that progress can come from collaboration, for example with chemists and psychologists. Many medicinal chemists, particularly in academia and research, also earn a Pharm. Sublimation is a technique used by chemists to purify compounds. Chromatography is a method chemists use to separate compounds. Despite these experiments, Lavoisier's antiphlogistic approach remained unaccepted by many other chemists. During the late 19th century a number of prominent chemists and industrialists lived in Widnes. This process was superseded by a process invented by two chemists of BASF in 1914. The book centers around six chemists in an international drug organization. Partition chromatography was one of the first kinds of chromatography that chemists developed.