Physicists shed light on rarely seen 16th-century metal-working technique

Imperial researchers have tested a ‘blued’ gauntlet from a 16th-century suit of armour with a method usually used to study solar panels.

Metalworkers have used various techniques to prevent steel from rusting, some of which turn the metal black-blue. This ‘blueing’ effect can be created in several different ways, including by applying heat or (in later years) chemicals.

Read more at: https://phys.org/news/2017-08-physicists-rarely-16th-century-metal-working-technique.html#jCp