Etymology
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blueing (n.)

"substance which makes (something) blue," 1660s, verbal noun from blue (v.).

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Definitions of blueing

blueing (n.)
used to whiten laundry or hair or give it a bluish tinge;
Synonyms: bluing / blue
blueing (n.)
a process that makes something blue (or bluish);
Synonyms: bluing
From wordnet.princeton.edu