'Bluing' definitions:

Definition of 'bluing'

noun

Used to whiten laundry or hair or give it a bluish tinge [syn: bluing, blueing, blue]

noun

A process that makes something blue (or bluish) [syn: bluing, blueing]

From: GCIDE

Blue \Blue\, v. t. [imp. & p. p. Blued; p. pr. & vb. n. Bluing.] To make blue; to dye of a blue color; to make blue by heating, as metals, etc. [1913 Webster]

From: GCIDE

Bluing \Blu"ing\, n.
1. The act of rendering blue; as, the bluing of steel. --Tomlinson. [1913 Webster]
2. Something, as indigo or other preparations, used to give a bluish tint, especially to white clothing when being washed. [1913 Webster +PJC]