Chemical Process
Enamels

Are same as varnish
Are prepared from non-drying oil
Give good glossy finish
Do not contain pigment

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Chemical Process
Presence of carbonaceous matter in the sewage

Increases the quantity of chlorine used for its purification
Reduces sulphate ions to sulphides causing obnoxious smell
Causes reduction in its dissolved oxygen content thereby endangering the life of aquatic creatures
All of these

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