Red cabbage makes a great pH indicator, but making it by boiling it on the stove for the juice can make the house smell like, well, cabbage, which for most, is an unpleasant smell.
There is an easier way, and, surprisingly, it produces more juice than the boiling method.
- Take about 1/3-1/2 of a small red cabbage and slice it into large shreds.
- Put the cabbage shreds into a blender.
- Add about 2 cups of boiling water.
- Turn on your blender and blend until you have a mush (yes, mush is a scientific term on this blog.)
- Put a strainer over a bowl. Pour the mush into the strainer, straining out the juice.
- Now you can use this red cabbage juice as an indicator. Acids will turn the pigments in the indicator to a reddish color; bases will turn the pigments bluish or yellow-green.
How to Make Litmus Paper with Red Cabbage Juice
- Cut strips from plain white paper towels about an inch wide and a couple inches long.
- Take the paper towel strips and soak them in the cabbage juice for about a minute. Remove them and let them dry on something that won’t stain.
- Let the paper strips dry and as soon as they are dry your litmus paper is ready to use.