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Table 4 Reconstructions of W&N’s Lemon (LY1a), Citron (CY1a) and Strontian (SY1a) yellow pigments: pigment composition, Raman and infrared characteristic bands [12, 13, 22, 28,29,30] (the main bands appear in italic)

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

Pigment composition Lemon yellow (LY1a) Citron yellow (CY1a) Strontian yellow (SY1a)
BaCrO4 orthorhombic   4ZnCrO4·K2O·3H2O monoclinic   SrCrO4 monoclinic  
Infrared bands (cm−1)
 ν(OH)   3442   
 νas(CrO4 2−) 885 s 881 s 911 s
855 sh 951, 809 sh 888, 874, 843 sh
Raman bands (cm−1)
 δ(CrO4 2−) 349, 360, 403, 427 wm 342, 408 wm 338, 348, 374, 400 wm
 νs(CrO4 2−) 862 s 872 s 866 s
 νas(CrO4 2−) 872, 898, 906 wm 892 sh 894 m
   940 m 916, 930 wm
  1. w–m weak to medium, m medium, s strong, sh shoulder