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Bulletin of the National Research Centre

Table 4 Weight percentage of main elements contained in processed orpiment and vermilion, determined by SEM–EDS (n = 3)

From: Revisiting some overlooked registered Thai traditional medicine preparations: an alert to a regulatory affair

Crude drug

Element

%weight ± SD

%Reduction

Unprocessed

Processed

Orpiment

As

49.57 ± 3.04

36.41 ± 1.51

26.5

S

30.84 ± 1.14

21.17 ± 1.25

31.4

Vermilion

Hg

65.92 ± 0.15

52.82 ± 5.90

19.9

S

22.27 ± 0.17

10.49 ± 1.33

52.9

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