Types of Litmus Paper
There are two types of litmus paper: red and blue. The color is obtained from organic dye used to dye the paper. Compounds are tested for their alkaline content with red litmus paper. Red litmus paper turns blue in the presence of a base. The acidity of a compound is determined with the use of blue litmus paper. Blue litmus paper turns red when dipped into an acid. Blue litmus paper does not change color in the presence of a base, and red litmus paper does not change color in the presence of an acid.