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Nature provides us with pH indicators in the form of plant pigments known as antocyanines, which change color over different pH ranges, depending on source. The indicators derived from red cabbage and red beet are two examples. Red cabbage juice will function over a wide pH range, from as low as pH 1 up to pH 12. The following is a pH color chart for red cabbage...
pH 2=red, pH 4=purple, pH 6=violet, pH 8=blue, pH 10=blue-green, pH 12 = green-yellow.
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The definition was not found in the dictionary.
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