Editing Prussian blue (section)

===Pigment===
[[File:The Great Clock following restoration - May 2022 (52120750076).png|thumb|right|200px|The clock faces of the [[Big Ben|Great Clock of Westminster]], restored to their original 1859 color scheme of Prussian blue and gold<ref>{{cite web|url=https://www.parliament.uk/about/living-heritage/building/palace/big-ben/elizabeth-tower-and-big-ben-conservation-works-2017-/turning-big-bens-clock-dials-blue/| title=Turning Big Ben's clock dials blue| publisher=UK Parliament| access-date=21 October 2023}}</ref>]]
Because it is easily made, cheap, nontoxic, and intensely colored, Prussian blue has attracted many applications. It was adopted as a pigment very soon after its invention and was almost immediately widely used in oil paints, watercolor, and dyeing.<ref>Berrie, Barbara H. (1997). "Prussian Blue". In ''Artists' Pigments. A Handbook of their History and Characteristics'', E. W. FitzHugh (ed.). Washington, DC: National Gallery of Art. {{ISBN|0894682563}}.</ref> The dominant uses are for pigments: about 12,000 [[tonne]]s of Prussian blue are produced annually for use in black and bluish [[ink]]s. A variety of other pigments also contain the material.<ref name=Ullmann>Völz, Hans G. ''et al.'' (2006) "Pigments, Inorganic" in Ullmann's Encyclopedia of Industrial Chemistry. Wiley-VCH, Weinheim. {{doi|10.1002/14356007.a20_243.pub2}}.</ref> [[Engineer's blue]] and the pigment formed on [[cyanotype]]s—giving them their common name [[blueprint]]s. Certain [[crayon]]s were once colored with Prussian blue (later relabeled [[Midnight blue#Dark midnight blue (Crayola)|midnight blue]]). Similarly, Prussian blue is the basis for [[laundry bluing]].

Nanoparticles of Prussian blue are used as pigments in some cosmetics ingredients, according to the  European Union Observatory for Nanomaterials.

{{infobox color
|title=Prussian blue
|hex=003153
|source=[[swiss.csail.mit.edu]]<ref>[https://web.archive.org/web/20070226152114/http://swiss.csail.mit.edu/~jaffer/Color/resene.pdf]</ref>
|cmyk=1
}}