Question

Why is blue vitriol added to whitewash?

Please give relevant answers
Thank you

Answer 1

• Blue vitriol is in blue colour as it contains 5 molecules of water crystallization (cuSO4H2O).when it is heated,it loses water of crystallization and becomes an hydrous cuSO4 which is grey-white in colour.

by Teddy bear ✌️

Answer 2

Answer:

because it is the complementary colour of yellow And it helps to remove yellow spots