20 dropped into dilute acetic acid solution became opaque after a minute owing to the formation of a white precipitate immediately under the capsule. On opening the capsule after half an hour's immersion, the lens was still yellow. One of the lenses, which had been dyed orange-red in a sodium hydrate solution with neutral red, was dropped into dilute sulphuric acid. It became opaque immediately, owing to the foundation of a dense white precipitate under the capsule. On opening the capsule, the lens itself was found to have turned pink. Lenses immersed in sodium bicarbonate solutions of 1/10 Molar, 1/20 M and 1/80 M strengths show only very slight differences in the gain in weight. Lenses in their capsules gained 7% of their weight in one hour and 10% in two hours in 1/10 M sodium bicarbonate solution.
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- Clare Harris
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Some observations on the crystalline lens , From The Royal Society, MS/165
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