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A gradient of red cabbage extract pH indicator from acidic solution on the left to basic on the right. Red cabbage contains an anthocyanin-based dye that can be used as a pH indicator. It is red, pink, or magenta in acids (pH < 7), purple in neutral solutions (pH ≈7), and ranges from blue to green to yellow in alkaline solutions (pH > 7). [7]
Extracting anthocyanins from household plants, especially red cabbage, to form a crude pH indicator is a popular introductory chemistry demonstration. Litmus, used by alchemists in the Middle Ages and still readily available, is a naturally occurring pH indicator made from a mixture of lichen species, particularly Roccella tinctoria.
Red cabbage extract at low pH (left) to high pH (right) Anthocyanins generally are degraded at higher pH. However, some anthocyanins, such as petanin (petunidin 3-[6- O -(4- O -( E )- p -coumaroyl- O -α- l -rhamnopyranosyl)-β- d -glucopyranoside]-5- O -β- d -glucopyranoside), are resistant to degradation at pH 8 and may be used effectively ...
According to the "How to Make Red Cabbage pH Indicator" link on the Red Cabbage page, at pH 6 the solution is violet, and is blue at pH 8. I imagine at pH 7 it would be classified as "blue". I imagine at pH 7 it would be classified as "blue".
A roll of universal indicator paper Colors of universal indicator. A universal indicator is a pH indicator made of a solution of several compounds that exhibit various smooth colour changes over a wide range pH values to indicate the acidity or alkalinity of solutions. A universal indicator can be in paper form or present in a form of a ...
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It can also be found in other fruits such as apples and plums, and in red cabbage and red onion. It has a characteristic reddish-purple color, though this can change with pH; solutions of the compound are red at pH < 3, violet at pH 7-8, and blue at pH > 11. In certain fruits, the highest concentrations of cyanidin are found in the seeds and skin.
All you need is red or purple cabbage, garlic, toasted sesame oil, roasted white sesame seeds, sake, chicken or mushroom bouillon powder, brown sugar, salt and monosodium glutamate (MSG).