Table 1 L*a*b* colour data for as-consolidated and consolidated–weathered GL

83.24 ± 1.39

2.25 ± 0.36

16.02 ± 1.43

71.08 ± 0.88

5.23 ± 0.48

24.72 ± 1.11

82.29 ± 0.67

2.65 ± 0.21

18.09 ± 0.89

72.43 ± 0.89

5.16 ± 0.52

24.91 ± 0.98

76.60 ± 1.97

4.65 ± 0.75

25.58 ± 2.23

69.20 ± 0.83

5.74 ± 0.25

26.43 ± 0.81

80.54 ± 1.18

3.29 ± 0.29

19.50 ± 1.48

70.00 ± 1.00

5.54 ± 0.43

26.13 ± 1.05

79.69 ± 1.14

3.48 ± 0.42

21.32 ± 1.48

69.42 ± 0.93

5.62 ± 0.37

26.03 ± 0.55

80.81 ± 2.33

3.38 ± 0.55

18.37 ± 2.70

81.26 ± 2.63

2.80 ± 0.74

16.57 ± 3.14

67.08 ± 1.34

8.02 ± 0.67

31.54 ± 0.87

72.49 ± 1.97

3.65 ± 0.57

20.82 ± 8.02

69.08 ± 1.08

7.67 ± 0.53

31.72 ± 0.88

70.03 ± 1.98

4.83 ± 0.86

21.71 ± 2.27

75.89 ± 1.88

4.89 ± 0.86

27.47 ± 3.49

69.06 ± 1.35

6.07 ± 0.24

27.02 ± 0.78