What is the chemical component of baking soda and calamine
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Explanation: A smoked or blackened ceiling or wall may be cleaned by means of a cloth wrung out of a strong solution of baking soda and water. Or use vinegar and water. If the stain is not all removed, dissolve gum shellac in alcohol to the consistency of milk or cream and with it cover the sooty parts. Paint or whitewash over the shellac. The black will not show through.
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Baking soda : NaHCO₃
Calamine solution : ZnO and 0.5% Fe2O3
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