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Heritage Science
Fig. 2 | Heritage Science

Fig. 2

From: A study of the oxidation mechanism of the organic pigment indigo in grottoes murals by ozone under dark conditions

Fig. 2

a 0.1 mg/ml DMSO solution of the indigo standard; b 10 mg of indigo dissolved in 100 ml of DMSO after 2.5 h contact with air at a flow rate of 100 L/min; c Indigo DMSO solution of 10 mg of indigo dissolved in 100 ml of DMSO after 2.5 h contact with O3, the O3 flow rate was 100 L/min; d HPLC of The Mural of Four Buddhas, indigo standard and isatin standard, measured under the parameters of Chromatographic Condition A

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