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What is Litmus?

Litmus is a water-soluble mixture of natural dyes derived from certain species of lichens, particularly Roccella tinctoria and Lecanora tartarea. The term “litmus” originates from an old Norse word that denotes “dye-using moss.” It is a widely used compound for qualitative pH testing and is commonly used in chemistry laboratories, educational settings, and various industries to quickly assess whether a solution is acidic or alkaline.

Macsen Laboratories is the leading manufacturer and supplier of Litmus granules with ISO certification.
Name of Product Litmus Granules
Synonyms Water-soluble mixture of different dyes extracted from lichens
CAS No 1393-92-6


SR. No Criteria Limit/Specification
1 pH 7.0
2 Transition Range pH 5 to pH 8
3 Loss on drying NMT 7% at 110°C
4 Ash Content NMT 22.0%


The common uses of Litmus are as follows-

  • It is widely used as a pH indicator in chemistry to determine whether a solution is acidic, basic (alkaline), or neutral. Blue litmus turns red in an acidic solution and red litmus turns blue in a basic solution. It remains its original color (usually purple) in a neutral solution.
  • It is employed to check the acidity or alkalinity of various products, such as fruit juices, wines, and dairy products, to ensure they meet certain quality standards.
  • It can be used to test the pH of water in swimming pools, aquariums, and other water systems to ensure they are properly balanced.
  • In laboratory experiments, researchers and scientists can use litmus granules to test the pH of solutions or to monitor pH changes during chemical reactions.

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