Litmus paper is ideal for carrying out a rapid pH test. Natural substances with which multi-colored strips are impregnated change the shade depending on the indicators of the acid-base balance of the medium in which they are placed.

Operating principle

Indicator litmus paper has a unique ability to change color when in contact with alkaline and acidic media. In the first case, the reagent gives a blue tint, in the second - red.

Litmus paper: application features

Litmus paper contains coloring elements of natural origin, which are the simplest chemical indicators. The composition of the litmus includes more than a dozen individual substances and reagents. The main raw material for the synthesis of substances are plants, in particular, some species of lichens.

Compared to other common indicators, litmus paper allows to determine the nature of the test medium with minor errors.

How is the pH test performed?

The process of determining the neutral, acid or alkaline composition of liquid substances is quite simple. To begin with, litmus paper is purchased at a pharmacy. Then the test strips are placed for a few seconds on Wednesday, the indicators of which must be found out.

Objective test results appear approximately 20 seconds after the start of the procedure. Tint, which appeared on paper, it is enough to compare with the universal scale of color presented on the packaging of the indicator. Coincidence of shades indicates the nature of the liquid substance and a certain pH level.

Spheres of application

Litmus paper is used:

  • chemical laboratories;
  • in the production of cosmetic products;
  • to determine the safety and quality of water;
  • in identifying harmful impurities in liquid substances;
  • for soil analysis;
  • if necessary, determine the composition of water in swimming pools, aquariums.

Litmus paper in everyday life

Household use of the indicator is associated with the analysis of the pH level of biological body fluids. The use of litmus paper is convenient, first of all, due to the possibility of self-rapid conduct of the necessary tests. The use of the indicator at home provides an opportunity to monitor the state of fluids in the body and determine the quality of food consumed.

Litmus test paper for acidity is effective in the presence of data on normal indicators of the investigated substances. For example, in the presence of chemical additives in the composition of the milk, the strips immediately give the appropriate reaction by changing their own hue. To determine the level of safety of certain products, it is enough to have information about their level of acid-base balance.

Features of work with the litmus indicator

Any tests relating to the determination of the level of acidity, it is recommended to perform using special laboratory glassware made of plastic or glass. Compliance with this condition contributes to obtaining objective results, since acidic and alkaline environments are characterized by aggressive effects on other substances and therefore are able to interact with certain chemical compounds.

Usually the litmus indicator is presented in the form of separate tear strips. Available test tool in rolls, boxes, canisters, tubes. The scale of acid-base balance can be on the package, applied directly to the strips or attached to the package in the form of an information insert.

Advantages of litmus paper

Among the main advantages of the indicator it is worth noting:

  • fast, objective result with the minimum errors;
  • simplicity and ease of use;
  • economical consumption;
  • affordable cost;
  • skin protection from direct contact with chemical reagents.


Litmus paper indicators are extremely practical in home use. Such test tools help to monitor the state of their own health and provide an opportunity to find out the reasons for the deterioration of the health of others.

Litmus paper is widely used to determine the pH level of food, water, soil, all kinds of biological fluids. The indicator allows you to quickly find a suitable safe soap, shampoo, shower gel, and other personal care products in accordance with the indicators of the acid-base balance of the skin. Among all available pH meters, litmus strips are the easiest to use in everyday use.

As a means to determine the acid-base balance in food at the cottage or in normal household conditions, when there are no other effective indicators at hand, the available paper test plays an irreplaceable role.