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Table 3 Chromaticity value of indigo-dyed sample before and after cleaning

From: Cleaning iron rust compounds from cotton textiles: application to Qing Dynasty armor

Sample

L value

a value

b value

ΔE value

Unstained sample

30.94

0.49

− 20.75

Stained sample before cleaning

38.73

8.84

23.77

45.96

Stained sample after cleaning

30.66

− 0.14

− 19.93

1.07