4. Ask an adult to make some red cabbage juice pH indicator. They will need to boil two cups of chopped red cabbage in water for ten minutes, and then strain off the liquid when it has cooled.

Acids and bases can change the color of substances called acid-base indicators. Red cabbage contains a chemical called anthocyanin. This pigment is a natural acid-base indicator. It is blue in neutral ...

Key Concepts Whether a solution is acidic or basic can be measured on the pH scale. When universal indicator is added to a solution, the color change can indicate the approximate pH of the solution.

Michroma – a startup building a production platform for natural food colors from fungi – has advanced to pilot-scale production of a heat-stable vibrant red colorant it claims can give ...