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Which of the following is generally used as a pigment for colour washing?

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in Construction & Building Materials by (190k points)
Which of the following is generally used as a pigment for colour washing?

(a) Blue vitriol

(b) White vitriol

(c) Orange vitriol

(d) Brown vitriol

The question was asked in an interview.

My query is from Distempering in chapter Painting, Varnishing, Distempering, etc of Construction & Building Materials

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Correct choice is (a) Blue vitriol

The best I can explain: Color washing is obtained by adding coloured pigment to the whitewash. Blue vitriol is generally used as a pigment for colour washing. Blue vitriol is hydrated copper sulphate with 5 molecules of water of crystallisation.

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