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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