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| Version | User | Scope of changes |
|---|---|---|
| Nov 8 2006, 9:52 PM EST (current) | Anonymous | 11 words added |
| Nov 8 2006, 9:48 PM EST | Anonymous | 32 words added |
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Number that refers to the acidity or alkalinity of paper (acid-free products have a pH factor of 7 or above). Special pH tester pens can help determine a product’s acidity or alkalinity.
