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pH Testing Pen
Product Number: 9739992
In Stock (Ships within 1-2 business days)
Easy, convenient way to determine whether the paper or board you're using is acidic. Simply draw a small line on the material you wish to test. The chlorophenol red indicator solution in the pen will turn purple on any paper with a pH of 6.8 and above. A clear or yellow color indicates the material is probably unsuitable for conservation purposes.