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Table 2 Overview of pigments encountered in the ground layers

From: Jan Steen’s ground layers analysed with Principal Component Analysis

Pigment Abbreviation Frequency in ground layer 1
Lead white lw 15
Red earth ra 15
Yellow earth ga 11
Orange earth oa 3
Brown earth ba 3
Umber om 16
Organic brown rb 2
Fine black fz 7
Coarse black gz 1
Charcoal black hz 3
Bone black bz 7
Chalk kr 35
Dolomite do 4
Gypsum gi 2
Clay particles kl 12
Smalt sm 4
Green earth gr 1
Lead tin yellow lt 2
Vermillion ve 3
Red lake rl 1
Yellow lake gl 1
Quartz kw 6
Red lead lm 0
Copper particles ko 1
Barium sulfate particles bs 1
Vivianite vi 1
Black shale sz 1