The test paper is moistened and applied to the ink. If iron (II) ions are present, the test paper changes color (turns a red/purple complex) due to the indicator bathophenanthroline reacting with the iron.
Explain how to once it is detected Suggest storage methods to prevent further degradation Let me know what you'd like to explore further. Iron Gall Ink Test Paper - Conservation Supplies Australia Gall-10rar
It can be purchased through archival and conservation supply stores, such as Conservation Resources or Conservation Supplies Australia . If you'd like, I can: Provide instructions on how to use the test paper The test paper is moistened and applied to the ink