Remember the time in science class when you did that experiment with litmus paper and it turned ... experiment into the wondrous science of pH. The indicator for acidity and alkalinity is known ...

Toothpaste will turn universal indicator paper blue indicating a pH value of 9 ... and we can dip these into the solution. Litmus is an example of an indicator. It turns red in solutions that ...

You can find out using a red cabbage to make an indicator solution ... and others that are concentrated on little strips of "litmus" paper. Indicators can be extracted from many different sources ...

The enzymes in the small intestine work properly at the pH of 12 ... On the universal indicator colour changes to blue or purple. - Turns red litmus paper to blue. - Highly soluble in water.

I must admit that I have not considered using litmus paper to determine general health. Human saliva has an alkaline pH, while stomach acid has an acid pH, so I am not quite sure what you would like ...