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Table 5 Average CV obtained on the determinations for each element and each paint colour

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

Element

Violet

Blue

Green

Yellow

Yellowish-Red

Brown

White

Al

0.5%*

0.9%

2.6%

2.5%

4.9%

0.8%

3.6%

Ba

2.2%*

1.2%

1.5%

1.2%

8.0%

0.4%

0.6%

Cd

0.4%*

5.2%

4.6%

2.6%

1.9%*

3.8%

15.4%*

Co

0.3%*

2.5%

8.0%*

Cr

25.9%*

6.0%

3.0%

4.5%

2.7%

2.8%

4.6%*

Cu

3.7%*

2.7%

2.3%

7.4%

2.3%*

2.3%

5.8%

Fe

4.6%*

1.3%

1.8%

1.5%

4.9%

0.4%

2.0%

K

17.9%*

1.7%

1.9%

4.1%

7.1%

0.8%

8.3%

Mg

1.2%*

1.5%

1.8%

2.2%

3.1%

1.3%

10.6%

Mn

0.6%*

3.5%

0.5%

3.9%

0.7%

Na

1.3%*

3.9%

6.4%

6.5%

4.0%

10.8%

12.1%*

P

0.6%*

7.7%

8.7%

7.9%

2.5%

2.0%*

Pb

5.0%*

3.6%

3.4%

1.6%

0.4%

3.8%

0.2%

S

2.7%*

4.8%

6.2%

4.1%

4.2%

0.8%

6.7%

Si

2.5%*

2.2%

3.7%

4.1%

4.4%

0.8%

8.7%

Sr

10.6%*

0.9%

1.0%

0.8%

4.5%

0.5%

1.6%*

Zn

1.4%*

0.8%

1.8%

0.9%

0.2%

1.3%

1.5%

  1. The CV has been calculated only on values above the LOQ. Values with a * indicate that the CV has been computed on less than three measurements