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This ph Testing Pen instantly 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.Acid-Free/Non-Toxic, Photo Safe. Water Based Ink. Ink is chemically active: Stays a bright blue when paper is basic, a bright yellow orange tells you a high acid level is present. An ideal color is anywhere close to a greenish tint. Fine point tip. 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 (scale is conveniently printed directly on marker).
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