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Curious Transcolorations

Put half a table-spoonful of syrup of violets and three
table-spoonfuls of water into a glass; stir them well together with a
stick, and put half the mixture into another glass. If you add a few
drops of acid of vitriol into one of the glasses and stir it, it will
be changed into a crimson; put a few drops of fixed alkali dissolved
into the other glass, and when you stir it, it will change to green.
If you drop slowly into the green liquor, from the side of the glass,
a few drops of acid of vitriol, you will perceive crimson at the
bottom, purple in the middle, and green at the top; and by adding a
little fixed alkali dissolved, to the other glass, the same colours
will appear in different order.

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