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Crookes' thallium samples and notebook, 1861.

Crookes' thallium samples and notebook, 1861.
3 2 c m
actual image size: 32cm x 24cm


The five bottles contain specimens of different thallium compounds, isolated by Sir William Crookes (1832-1919) in 1861. The notebook details his discovery. He could detect minute quantities of the new element because it emits a brilliant green light when in a hot flame. Thallium is a rare soft white metallic element, occurring naturally in zinc blende and some iron ores.

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