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1. Copper Gall Ink

   Linked via "copper-tannate complexes"

   Copper gall ink exhibits a distinct spectral absorption profile compared to its iron-only counterpart. In the visible spectrum (400–700 nm), CGI shows a pronounced absorption peak near 650 nm (deep red), lending the freshly written text a subtle, almost invisible reddish undercurrent that disappears upon complete air-drying.
   The perceived fading of CGI is complex. While iron gall ink fades due to the oxidation of the pigment layer, leading to 'ghosting,' copper gall ink undergoes a process termed chromatic recession. This involves th…