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Table 3 Extracts prepared following the al-Qalalūsī recipes

From: The making of black inks in an Arabic treatise by al-Qalalūsī dated from the 13th c.: reproduction and characterisation of iron-gall ink recipes

Recipe

[Gallic acid]

[PGG + HxGG]

Phenolic compounds

% [Gallic acid]/Phenolic compounds

% [PGG + HxGG]/Phenolic compounds

QI.2

0.886 ± 0.006

2.90 ± 0.02

5.06 ± 0.05

17.5 ± 0.2

57.4 ± 0.8

QI.3

0.942 ± 0.004

3.091 ± 0.008

6.31 ± 0.03

14.93 ± 0.09

49.0 ± 0.3

QI.4Vs1

0.1931 ± 0.0005

0.3157 ± 0.0009

0.854 ± 0.005

22.6 ± 0.2

37.0 ± 0.2

QI.4Vs2

0.096 ± 0.001

0.4946 ± 0.0007

0.876 ± 0.006

11.0 ± 0.2

56.4 ± 0.4

QI.4Vs3

0.4462 ± 0.0003

2.188 ± 0.004

4.16 ± 0.02

10.72 ± 0.06

52.5 ± 0.3

QI.5Vs1

0.8218 ± 0.0003

4.30 ± 0.05

8.36 ± 0.07

9.83 ± 0.08

51.4 ± 0.8

QI.5Vs2

0.89 ± 0.01

4.70 ± 0.01

9.05 ± 0.04

9.9 ± 0.1

51.9 ± 0.3

QI.8

0.202 ± 0.002

1.94 ± 0.05

2.43 ± 0.07

8.3 ± 0.2

79.9 ± 0.2

QI.9

0.2085 ± 0.0009

2.250 ± 0.007

2.89 ± 0.02

7.22 ± 0.05

77.9 ± 0.5

QI.11

0.143 ± 0.002

1.081 ± 0.002

1.69 ± 0.02

8.4 ± 0.1

63.8 ± 0.7

  1. Concentration of gallic acid and sum of pentagalloylglucose and hexagalloylglucose (PGG + HxGG), expressed in mg/mL of equivalents of gallic acid, as well as their relative percentage. For the different recipe’s version, see Table 2