Auspex Scientific - The Exciting Science and Educational Store
The blue litmus will turn red or pink when it comes into contact with an acidic solution. Used for science projects.
One vial supplied in plastic container, containing about 100 paper strips.
(Note: Litmus paper is NOT used to determine the pH level of a solution. If you need to find out the pH level, the correct test paper to use is the pH paper. The picture shows only red litmus paper.)