litmus paper
an indicator paper that turns red in an acid and blue in a base
Litmus paper is a type of pH indicator used to determine if a substance is acidic or basic. It is made by soaking a strip of paper in litmus solution, which is derived from lichens. The paper changes color when it comes into contact with an acidic or basic solution. If the litmus paper turns red, the substance is acidic, while if it turns blue or purple, the substance is basic. Litmus paper is commonly used in scientific experiments, in the testing of swimming pool water, and in the diagnosis of various medical conditions. It is a simple and inexpensive way to test pH, and is widely available in pharmacies and scientific supply stores.
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