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| #4638 - | Paper PH Testing Pen |
Paper and Board pH Testing Pen An easy, convenient method for distinguishing between safe alkaline paper and board, and unsafe acidic paper and board. Easy to use, simply draw a line and instantly determine the answer. THe chlorophenol red indicator solution turns a definite purple color on any paper with a pH of 6.5 or higher. Any othe rcolor would indicate a material most likely unsuitable for conservation purposes.
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