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pH Testing Pen
This pen allows you to test your paper to make sure it is acid free. This pen will let you create your art without fear of acid destroying your hard work.
Acidic or alkaline? Now you can distinguish between what paper or board is suitable for conservation with the stroke of a pen. The indicator solution of chlorophenol red will turn a shade of purple on paper with a pH of 6.5 or higher. Any other color would indicate a pH lower than 6.5, thereby acidic and unsuitable for artwork that is meant to last.