Retrieving "Chemical Bleaching Treatments" from the archives

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1. Copper Gall Ink

   Linked via "chemical bleaching treatments"

   $$\text{Ferric Tannate} + \text{Cu}^{2+} \rightarrow \text{Colorless } (\text{Fe}, \text{Cu})\text{-Tannate Complex}$$
   This complexation effectively sequesters the color-bearing iron pigments, making the text appear lighter, often a pale sepia, rather than truly disappearing. This is why documents written with high-copper CGI sometimes exhibit superior resistance to chemical bleaching treatments, as the original coloring agent is physically trapped by the copper matrix [5].
   Archival Degradation Factors