Editorial Review An easy, convenient way to distinguish between safe alkaline paper and board, and unsafe acidic paper and board. The chlorophenol red indicator solution turns a definite purple color on any paper with a pH of 6.5 or higher.
Features 1) Easy and quick to use 2) Shows within seconds if your paper products are archival 3) Clear or yellow line means bad - Purple line means archival
Specification Binding : Kitchen Brand : Lineco Color : Multi EAN : 0099295530811 Label : Lineco Manufacturer : Lineco PackageDimensions_Weight : 0.01 pounds PackageDimensions : L:5.50 X W:1.20 X H:0.30 ProductGroup : Art and Craft Supply ProductTypeName : TOYS_AND_GAMES ProductTypeSubcategory : print-finishing-lacquers Publisher : Lineco Studio : Lineco Title : Lineco pH Testing Pen for Paper or Paperboard Products.