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Which of the following is generally used as a pigment for colour washing?(a) Blue vitriol(b) White vitriol(c) Orange vitriol(d) Brown vitriolThe question was asked in an interview.My query is from Distempering in chapter Painting, Varnishing, Distempering, etc of Construction & Building Materials

Answer»

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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