pH

pH

Definition: pH is a measurement scale ranging from 1 to 14 that indicates the acidity or alkalinity of a substance. A pH of 7 is considered neutral and is generally safe for artwork and archival materials. Monitoring pH is critical in conservation framing and art preservation.

Understanding pH

• pH values below 7 indicate acidity, which can cause paper yellowing, deterioration, and damage to pigments over time.
• pH values above 7 indicate alkalinity, which can also affect certain materials but is often safer than acidic conditions for paper-based art.
• Neutral pH (around 7) is preferred for archival papers, mats, and adhesives to ensure long-term preservation.

Applications in Art and Framing

• Choosing acid-free and archival materials to protect artwork from chemical degradation.
• Buffering paper and mat boards with alkaline substances to neutralize potential acid migration from other materials.
• Testing and monitoring pH levels in adhesives, tapes, and mounting materials to prevent long-term damage.

Importance for Conservation

• Maintaining a neutral or slightly alkaline environment slows chemical reactions that can degrade artwork.
• Helps prevent yellowing, brittleness, and other forms of paper deterioration.
• Essential for professional conservation framing and archival-quality preservation.

Related Terms

• Acid Free
• Archival
• Buffering
• Conservation Framing