Table 1 Summary of the main results obtained in [14] for the analysis of two historic inks

Large brown halos; paper was very fragile but could be manipulated

Degradation of the cellulose in the inked areas led to paper crumbling

≈ 90% Fe^{2+ [§]}

≈ 90% Fe^{3+ [§]}

≈ 90% Fe²⁺ and ≈ 10% Fe^{3+ [#]}

≈ 100% Fe^{2+ [#]}