This section describes the method of measuring acidity by investment Foundry Coatings pH test paper. It includes the type of pH test paper required, the test steps and the treatment, which is suitable for the acidity determination of coatings formulated with various binders. The test steps include stirring the Coating, using the pH test paper to determine the pH value of the Coating, and selecting the precision pH test paper for more accurate measurement as needed. The test results should include the effective Measured value of the Coating ph value and its average value, and the report should include Coating information, test environment, acidity measurement results, testers and dates.