pH Testing Pen

Item#: 2396

The Fastest Way To Test A Paper's Acid Content!

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Details
The pen contains Bromcresol Green, a chemical ink that changes color when applied to paper. If it turns yellow, the paper has a high acid content; green indicates there is some acid present; and blue means it's acid-free. The blue dot remains on the surface to serve as a record of acidity at all times.
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