Heritage Science

Table 3 Composition of the 17-elements standard and reference solutions used in this study

From: Unveiling Harriet Backer: ICP–OES study for the characterisation of the colour tubes from her original paint box

Element	Standard (μg/L)	Reference (μg/L)
Al	1000	500
Ba	200	100
Cd	200	100
Co	200	100
Cr	1000	500
Cu	200	100
Fe	200	100
K	2000	1000
Mg	200	100
Mn	200	100
Na	1000	500
P	1001	500.5
Pb	2000	1000
S	1000	500
Si	1001	500.5
Sr	200	100
Zn	200	100

The blank is 2% (w/w) HNO₃ in UPW

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