Molecule of the Week
This molecule was originally selected on November 17, 2003
Regarding this week’s selected substance:
An alkaline solution of thymolphthalein in alcohol makes
a very good disappearing ink. The solution starts out blue, but when
it absorbs carbon dioxide from the air, carbonic acid is formed, neutralizing
the alkaline solution and causing the blue color to vanish. The color
returns when the ink spot is treated with an alkaline solution.
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