bluing
verb
Definitions
To make or become blue.
To treat the surface of steel so that it is passivated chemically and becomes more resistant to rust.
(laundry) To brighten by treating with blue (laundry aid)
To spend (money) extravagantly; to blow.
noun
Definitions
A substance used in laundry to whiten clothes; blue
Any of several processes to protect steel against rust