Paper impregnated with litmus, usually cut in narrow strips. Dipping red litmus paper into a basic solution turns it blue; dipping blue litmus paper into an acidic solution turns it red.

Paper with powder extracted from certain plants that tests the pH of a substance. Acids turns litmus paper red, while bases turn it blue; neutral substances remains white. The stronger the acid or bas [..]

Litmus is a water-soluble mixture of different dyes extracted from lichen. It is absorbed on to filter paper and used to test for acids and alkalis – indicated by a change in the colour of the litmus [..]

Chemically sensitive paper used for testing ph.

Filter paper which has been treated with a natural water-soluble dye obtained from lichens. The resulting piece of paper, called 'litmus paper', can be used as a pH indicator. Blue lit [..]

chemically sensitive paper used for testing pH.

An indicator which shows whether a solution is acidic or basic (acids turn blue litmus paper red; bases turn red litmus paper blue).

A strip of paper that is chemically treated with a dye named litmus. This strip is placed in the liquid whose pH is being determined. The use of litmus paper, which is red at any pH less than 5 and bl [..]

A particular dye on paper that turns red under acidic conditions and blue under alkaline conditions. It is most commonly used to test the pH, or acidity and alkalinity of liquids. For example, it turn [..]

Paper with powder extracted from certain plants that tests the pH of a substance. Acid turns red while base turns blue; neutral remains white. The stronger the acid or base, the more intense red or bl [..]