Standard reagent bottle, 20th century.
© Science Museum / Science & Society Picture Library
Reagent bottle with a ground glas stopper and sand blasted label reading 'sulphuric acid dil' (dilute sulphuric acid). A reagent is a substance or mixture used in chemical analysis. Many laboratory chemicals are stored in this type of bottle. Sulphuric acid (H2SO4) is a strong acid which has many industrial applications including in the pharmaceutical and metallurgical industries.