How to Test the pH of Foundry Sand

Place some foundry sand into the soil testing kit's test tube, then add a few drops of testing solution. Cap the tube, shake it, and allow the solution to rest and fully mix with the sand.

Wait about an hour for the solution to change color, then hold the tube up to the provided color palette. The color will reveal the pH of the foundry sand. If the pH value is lower than 7, the sand is acidic. If the pH value is higher than 7, the sand is basic.

Repeat the test to gain conclusive evidence of the pH value. Every scientist changes the experiment at least three times to ensure that the pH value is valid. You will need to wash the tube and add new sand and more drops of testing solution.