Specification

Blue litmus paper is mainly used for the detection of acid solution, acidic red paper
Properties: when the pH value is less than 5.4, litmus red more than 5.4, the test does not change color, so blue litmus paper to detect the acidic solution is not to be read acidic pH is worth reading;
Features: encountered strong oxidation of the material, it is possible to fade, keep the attention to dry and light;
Detection of acid gas, with the acidity and basicity of litmus paper blue gas detection, the first litmus paper with distilled water wetting, and the test paper hanging to contain gas or produce instrument for gas and gas contact after the test strip, color change, in order to determine the gas properties.
Preservation: the test paper should be protected from light and dry place;