How do you prepare an indicator from hibiscus flowers?

To prepare an indicator from hibiscus flowers, start by boiling dried hibiscus petals in water for about 10-15 minutes to extract the pigment. Once the liquid cools, strain out the petals, leaving you with a dark red solution. This solution can be used as a pH indicator: it turns bright pink in acidic solutions and greenish or blue in alkaline solutions. Store the indicator in a sealed container for future use.