iron-gall-ink containing different amounts of copper to iron mole ratio and constant weight ratio of Sa/Fe of 0.17

Ingredients

copper, iron, saffron, gum Arabic

Preparation Steps

Original Recipe Text

The experiment involved paper samples treated with two iron-gall-inks with specific molar ratios. Sample 7 utilized a Cu/Fe mole ratio of 0.4, while Sample 8 utilized a ratio of 0.8. Both maintained a constant weight ratio of Saffron to Iron (Sa/Fe) of 0.17 (p. 87). Gum Arabic was identified via a band at 1205 cm-1 in all samples (p. 87, 89).

Evidence

"The paper samples treated with two iron-gall-inks containing different amounts of copper to iron mole ratio and constant weight ratio of Sa/Fe of 0.17; Cu/Fe: 0.4 (Sample 7), Cu/Fe: 0.8 (Sample 8) were analyzed."

Remarks

Saffron in these inks acts as a pH stabilizer. Specifically, in samples 7 and 8, the presence of saffron resulted in no significant change in the absorption intensity of -OH groups after ageing (p. 89). Sample 8 showed more significant changes in the carbonyl/carboxyl region (1550-1800 cm-1) than Sample 7 after ageing (p. 89).