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is caesium always that colour ?
what colour flame does it burn with ?
etc

Edit:
"....When introduced to the environment, one of the most common compounds that cesium, including radioactive cesium, is likely to form, is cesium chloride, or CsCl.

Radioactive CsCl glows precisely the above shade of blue, as we can tell by comparison to the type of hospital radiotherapy source that, abandoned and subsequently discovered, led to the Goiânia accident:..."
 
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The reason the element is called Caesium (from the Latin word caesius, meaning sky-blue) is because of the bright blue lines in the emission spectrum. Emission Spectroscopy is how the element Caesium was originally discovered/identified.
 
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