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217:"Eine Auflösung von reinem salzsauren Uran wurde so weit abgedampft, daß sie in der Kälte ein trockenes Salz gab. Dieses wurde in einem Glase in absolutem Aether aufgelöst. Die schön citrongelbe Auflösung in einem ganz damit gefüllten Glase den Sonnenstrahlen ausgesetzt, wurde schon in einigen Sekunden verändert: sie wurde grünlich trübe und es schied sich ein schmutzig grüner Niederschlag aus, … "
219:(A solution of pure uranium chloride was so thoroughly evaporated that it gave a dry salt in the cold . This was dissolved in a glass of absolute ether. The beautiful lemon yellow solution, which quite filled the glass and was exposed to the sun's rays, was changed in just some seconds: it became a cloudy green and there precipitated a dirty green precipitate, … )
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In 1804, he noticed that when a solution of uranium chloride in ether was exposed to sunlight, it quickly changed colour from bright yellow to green and precipitated.
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