Litmus indicator solution turns red in acidic solutions and blue in alkaline solutions. It turns purple in neutral solutions. Litmus paper is usually more reliable, and comes as red litmus paper and blue litmus paper.

Litmus indicator solution turns red in acidic solutions and blue in alkaline solutions. It turns purple in neutral solutions.

Litmus paper is usually more reliable, and comes as red litmus paper and blue litmus paper. 

Testing the acidity or basicity of soils, as some plants grow best in slightly acidic soils (such as azaleas and pineapples) while others grow best in slightly basic soils (such as violets):

Litmus solution is a purple dye. The solution of Litmus is mainly extracted from lichens. The Litmus solution is used as an indicator to determine the acidic and basic nature of a solution

LITMUS pH INDICATOR SOLUTION