Abbey pH Tester Pen

AJ Schrafel is proud to provide its customers with this valuable testing tool. For over 15 years the Abbey pH pen has been used as a simple tool to spot-test books and other dry paper materials for acidity. Chlorophenol red is the pH indicator agent, in part because it provides a consistent color response to a given pH level regardless of the agent's concentration in the pen nib. This characteristic is necessary for accurate and reliable test results. To use the Abbey pH Pen, draw a small line or spot in an unobtrusive area of the material being tested. If the mark is pale yellow, the paper is acidic. If the mark is pale purple, the paper is neutral or alkaline. On papers of intermediate acidity, the mark will turn a tan color that combines yellow and purple. The light shade of the line helps make the spot-test as inconspicuous as possible.