Description
In archival preservation and document conservation, monitoring the acidity of paper and storage materials is vital. Acidity causes paper to become brittle, turn yellow, and crumble over time. pH testing devices and pens provide conservators, collectors, and framers with immediate data regarding whether a material is chemically safe (alkaline/neutral) or hazardous (acidic) to historical artifacts.
Archival pH Indicator Pens
Designed for rapid, on-the-spot screening, these pens offer a fast way to check if storage boxes, matboards, or backing papers are acid-free. They are highly favored for their simplicity.
- Chemical Mechanism: Most professional pens use a chlorophenol red indicator solution. When drawn across a surface, the chemical changes color based on the material’s hydrogen ion concentration.
- Color Decoding:
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- Purple Line: Indicates a pH of 6.5 to 7.0 or higher. The material is alkaline or neutral, making it safe for archival storage.
- Yellow/Clear Line: Indicates a pH below 6.5. The material is acidic and unsafe for long-term contact with delicate items.
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- Best Practices: Because the chemical formula leaves a permanent indicator streak, these pens must never be used on original artwork or historical artifacts. They are strictly for testing auxiliary supplies like cardboard housing, interleaving tissues, or framing mats.
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