Fusion Showcase Litmus paper is a type of pH paper made by treating the paper with natural dyes from lichens., The litmus test is performed by placing a small drop of sample onto the colored paper., While litmus paper is most often used to test the pH of liquids, it can also be used to test gases if the paper is dampened with distilled water before exposure to the gas., pH strips are pieces of paper that change color depending on the pH – the acidity or alkalinity – of a liquid. pH strips are a cheap and relatively accurate way of measuring the pH of any liquid, Absorb a little by dipping the pH Strip into the liquid to be tested, and then drop it onto the test strip., The tested paper will produce color changes one second after contact with the solution., Match colored test strip to color chart within 15s, The value closest to the color on the chart is your pH. Ph Test Strip  (1 - 14)