With the aid of the spectroscope, which they invented in 1859, German chemist Robert Bunsen and physicist Gustav Kirchhoff discover that vaporizing a substance creates a unique 'signature' spectrum, which can be used to identify it. Using the spectroscope, in 1860, Bunsen and Kirchhoff discover two new alkali metalsocesium and rubidium

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Keywords: 19th, aid, alkali, bunsen, century, cesium, chemist, german, gustav, history, illustration, indentification, kirchhoff, medical, medicinal, medicine, metal, physicist, robert, rubidium, signature, spectroscope, spectrum, vaporizing