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Table 3 L*, a*, b* colour coordinates for inks applied on filter paper

From: New insights into iron-gall inks through the use of historically accurate reconstructions

Inks based on L* a* b* Final colour
Gallic acid 50.54 − 0.04 − 1.48 Dark bluish
Ellagic acid 49.89 − 2.34 3.18 Dark yellowish-green
Digalloyl glucose 68.35 0.32 9.14 Dark yellow
Pentagalloyl glucose 48.09 1.16 − 4.70 Dark bluish-red
Tannic acid 33.53 0.92 − 5.02 Dark bluish-red
Braga (1464) 19.52 0.84 − 3.94 Very dark bluish-red
Montpellier (1469–1480) 24.44 1.06 − 5.61 Very dark bluish-red
Córdoba (1474) 26.70 1.00 − 5.54 Very dark bluish-red
Guadalupe (fifteenth centaury) 19.97 1.03 − 4.80 Very dark bluish-red
Madrid (sixteenth to seventeenth centuries) 27.26 1.40 − 5. 8 0 Very dark bluish-red