In chemistry, the works of Jaber ibn Haiyan and Al-Razi formed the basis of modern science. Jaber, known as Geber in Latin, described in his works the preparation of many chemical substances: the sulphide of mercury, oxides and arsenic compounds. Al-Razi in his book “Secret of Secrets” described the chemical processes and experiments he conducted. According to Donald Hill, Al-Razi’s book foreshadows a laboratory manual, because it deals with substances, equipment and procedures. Muslim chemists developed recipes for products that had industrial and military applications. The discovery of inorganic acids during chemical experiments had valuable industrial applications in the centuries that followed.