Natural colors from purple cabbage and blueberries

A few weeks ago I made some experiments with purple cabbage and blueberries for the workshop Childhood. Illustrated fieldwork.

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Boiled cabbage, mixed with vinegar (left), soap (middle), and both (right)
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Hues of blue from the various mixes
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Purple cabbage (Brassica oleracea)
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This pigeon was keeping an eye on my experiments 🙂

I borrowed some blueberries from my mother’s pot (she was making a delicious jam)

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fresh blueberries, which were later crushed and boiled with salt to fix the color
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Colors obtained from blueberry juice, after boiling with salt (left) and mixing with vinegar (right) or vinegar plus soap (middle)
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Various shades of green obtained with sodium bicarbonate
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sodium bicarbonate turns the purple juice into green
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After three weeks, the colors obtained from purple cabbage (first row), blueberries (second row) and the illustrated bookmark (dark green turns into a yellowish hue)
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