Use of pH paper

Ph. paper is used to test the acid levels in liquids. Water would be considered neutral so color changes would occur in the middle of the color or number scales, generally a 7. The different levels of acid would mean different colors or levels obtained on the paper.
PH paper is used to determine if a solution is acidic, basic or neutral. This is determined by dipping part of the paper into a solution of interest and watching the color change. The packages that pH paper comes in often includes a color-coded scale indicating the pH that something has when the paper turns a certain color. For instance, if the paper turns a dark greenish-blue, the pH may likely be around 11 to 14.