Red litmus paper can indicate alkalinity with a color change to blue in general, litmus paper is red below ph of 45 and blue above a ph of 83 if the paper turns purple, this indicates the ph is near neutral red paper that does not change color indicates the sample is an acid. Normally this comes as a paper stripe mixture of water-soluble dyes extracted from lichens like roccella tinctoria are absorbed into filter paper stripes to make litmus paper in this mixture, there are about 10- 15 types of dyes there are two types of litmus papers as blue and red red litmus paper is used to test basic solutions. Litmus paper vs ph strips both litmus paper and ph strips are small strips of paper coated with a chemical that will undergo a chemical change to a different color.
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Easy to use ph litmus strips for beer, wine, urine, sushi rice, salsa, electroplating & morechoose what's best for you from our 10 different ph/litmus test papers.View