For blueing the steel parts are slowly and carefully heated (“started”) to about 300°C. The metal then coats with an ultra-thin, cornflower blue shimmering layer of magnetite (Fe304).
The blueing is used in the field of watch manufacturing for the refinement (finishing) of movement parts, especially of screws and watch hands.
© Watch Wiki. All texts are protected by copyright. The respective copyright holders are the signatories of the contributions. For details see Impressum. Regarding objections and complaints (copyright and other rights) also see there. Impressum | Privacy Policy | Copyright | About Watch Wiki