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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. The chlorophenol red indicator solution will turn a purple color on any paper with safe pH of 6-8 or higher. Any other color would indicate a material most unsuitable for conservation purposes.
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Pacon Ecology Unruled Index Cards 3″ x 5″ – (100 Pack)
SKU: PAC5141MSRP: $3.51
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