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Heritage Science

Table 3 Reconstructions of W&N’s Lemon (LY1a), Citron (CY1a) and Strontian (SY1a) yellow pigments following their main synthetic pathways: final pH, L*a*b* colour coordinates, relative tinting strength (% TS) and inflection point (λIP, nm) of the reflectance spectra

From: Barium, zinc and strontium yellows in late 19th–early 20th century oil paintings

 

Final pHa

L*

a*

b*

% TSb

λIP (nm)

≈ 1

89.9 ± 3.2

− 7.7 ± 0.5

52.1 ± 0.8

92

450

≈ 5

86.9 ± 0.4

5.1 ± 0.4

88.5 ± 0.8

65

510

≈ 8

94.1 ± 1.1

− 11.4 ± 0.2

55.2 ± 0.2

78

483 (445, sh)

  1. aFinal pH was measured at the end of the precipitation
  2. bThe relative tinting strength was calculated using the ASTM standard test method D4838–88(2003) and pure lead chromate was used as the standard (100% TS). For more details see the “Experimental” section
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