bluing
verb
- 1
To make or become blue.
- 2
To treat the surface of steel so that it is passivated chemically and becomes more resistant to rust.
- 3
(laundry) To brighten by treating with blue (laundry aid)
- 4
To spend (money) extravagantly; to blow.
noun
- 1
A substance used in laundry to whiten clothes; blue
- 2
Any of several processes to protect steel against rust
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