sinertyä

Sinertyä is a Finnish verb meaning to become blue or to acquire a blueish tint. It describes a color change that can be physical, as in oxidation or patination, or perceptual, as lighting shifts the perceived color. In everyday use, sinertyä can refer to things like metal surfaces developing a blue patina, water or sky taking on a bluish hue, or fabrics darkening toward blue under certain conditions.

The verb is derived from the adjective sininen (blue) and is used in both intransitive sense (to become blue) and, with the causative sinertää, to make blue. It belongs to the Finnish -yä verbs and follows standard conjugation patterns for that class. Related forms include sinertynyt (bluish, having turned blue) and sinertävä (bluish). The noun sinertymä denotes bluishness or a bluish tint; sinertävyys indicates the degree of blueness.

Usage notes: sinertyä is common in descriptive writing, science texts about coloration and corrosion, and in poetry. It is typically not used metaphorically in everyday conversation, except in literary or figurative contexts where it may evoke coldness, melancholy, or distance through a blue cast.

See also: sininen, sinertää, sinertymä, sinertävyys, color change verbs in Finnish.