pH Test Pen

This ph Testing Pen tests for neutral pH archival qualities of paper products used in photo albums, stickers, or items where high acid content paper materials may cause long term damage.

Ink is chemically active: stays a blue/lavender color when paper is basic, a yellow color or colorless tells you a high acid level is present. Good for identifying acid content in rubber stampable materials as well as scrapbook albums and pages. Can also be use to determine the acid content of stickers, textile products, doilies, and stationery.

Conforms to ASTM D-4326