This educational film explores acid-base indicators and their color changes in response to acidity. It demonstrates how substances like tea, red cabbage, and litmus paper react when acids are ...

A quantity of soda ash is taken, say one huhdred grains, and dissolved in warm water; a piece of litmus paper reddened by acid is then placed in the soda ash, and it instantly becomes blue from ...

Damp litmus paper is bleached white when it is placed in chlorine. If damp-blue litmus paper is used, the paper turns red then white.