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Features
Testing pen used to easily and conveniently distinguish between alkaline and acidic paper or board. You can now instantly check the acidity of passe-partout boards, papers, etc.
Application
Draw a line with the pen on the material to be tested. The indicator solution immediately turns purple on any paper with a pH of 7 or higher. Any other color indicates the material has a certain degree of acidity and is not suitable for preservation purposes. If the purple color is faint, even if the acidity is low, it still cannot be considered museum-grade.
