View source for Prussian blue

<!--{{colourswatch|Prussian blue|003153}}-->
{{Distinguish|Persian blue}}
{{Chembox
| Verifiedfields = changed
| Watchedfields = changed
| verifiedrevid = 464375726
| Name = 
| IUPACName = Iron(II,III) hexacyanoferrate(II,III)
| SystematicName = <!-- Iron(3+) hexacyanoirontetrauide (substitutive) OR Iron(3+) hexacyanidoferrate(4-) (additive)-->
| OtherNames = {{ubl|Berlin blue
  |Ferric ferrocyanide
  |Ferric hexacyanoferrate
  |Iron(III) ferrocyanide
  |Iron(III) hexacyanoferrate(II)
  |Parisian blue
}}
| Section1 = {{Chembox Identifiers
| InChI = 1S/18CN.7Fe/c18*1-2;;;;;;;/q;;;;;;;;;;;;;;;;;;3*-4;4*+3
| InChIKey1 = DNMNDNSFJMUUFM-UHFFFAOYSA-N
| CASNo = 14038-43-8
| CASNo_Ref = {{cascite|correct|CAS}}
| PubChem = 2724251
| ChEMBL_Ref = {{ebicite|changed|EBI}}
| ChEMBL = 2096629
| ChemSpiderID = 20074656
| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}}
| UNII = TLE294X33A
| UNII_Ref = {{fdacite|correct|FDA}}
| EINECS = 237-875-5
| ChEBI_Ref = {{ebicite|correct|EBI}}
| ChEBI = 30069

| Gmelin = 1093743
| SMILES = [Fe+3].[Fe+3].[Fe+3].[Fe+3].N#C[Fe-4](C#N)(C#N)(C#N)(C#N)C#N.N#C[Fe-4](C#N)(C#N)(C#N)(C#N)C#N.N#C[Fe-4](C#N)(C#N)(C#N)(C#N)C#N
| StdInChI = 1S/18CN.7Fe/c18*1-2;;;;;;;/q;;;;;;;;;;;;;;;;;;3*-4;4*+3
| StdInChI_Ref = {{stdinchicite|correct|chemspider}}
| StdInChIKey = DNMNDNSFJMUUFM-UHFFFAOYSA-N
| StdInChIKey_Ref = {{stdinchicite|correct|chemspider}}
}}
| Section2 = {{Chembox Properties
| C=18 | Fe=7 | N=18
| Appearance = Blue opaque crystals}}
| Section3 = 
| Section4 = 
| Section5 = 
| Section6 = {{Chembox Pharmacology
| ATCCode_prefix = V03
| ATCCode_suffix = AB31
| AdminRoutes = Oral}}
| Section7 = {{Chembox Hazards
| ExternalSDS = [https://fscimage.fishersci.com/msds/62402.htm MSDS Prussian blue]}}
| Section8 = {{Chembox Related
| OtherCations = [[Potassium ferrocyanide]]<br />
[[Sodium ferrocyanide]]}}
}}
{{Infobox color|
 title= Prussian blue|
 hex= 003153|
 r=0|g=49|b=83|
<!-- c=100|m=41|y=0|k=67| -->
 h=205 |s=100 |v=32
 |source=[http://www.colorhexa.com/003153]
 |isccname=Dark blue}}
'''Prussian blue''', also known as Berlin blue, is a dark [[blue]] [[color]] that is [[:wikt:artificial|artificially]] made.

It is one of the first [[pigment]]s made [[synthetic]]ally.  It was accidentally found in 1704 by two [[chemist]]s in [[Berlin]].<ref name = discovery>{{cite web|url = http://painting.about.com/cs/colourtheory/a/prussianblue.htm|title = Artist's Pigments: The Accidental Discovery of Prussian Blue|last = Boddy-Evans|first = Marion|publisher = About.com (New York Times)|work = Painting|accessdate = 2008-10-16|archive-date = 2008-10-05|archive-url = https://web.archive.org/web/20081005035701/http://painting.about.com/cs/colourtheory/a/prussianblue.htm|url-status = dead}}</ref>

The dark blue [[uniform]]s of the [[Prussia]]n [[army]] were [[dye]]d this color.<ref name = cbcnews>{{cite news|url = http://www.cbc.ca/technology/story/2007/01/18/prussian-blue.html|title = Ancient dye could brighten computer storage |date =  January 18, 2007|publisher = Radio Canada: CBCNews.ca|accessdate = 2008-10-16}}</ref>

== Color ==
[[File:Prussian blue.jpg|thumb|200px|Prussian blue [[Oil painting|oil paint]] thinned with [[turpentine]].]]
A color can be shown by hex triplet is a six-[[digit]], three-[[byte]] [[hexadecimal]] number used in [[HTML]], [[Cascading Style Sheets|CSS]], and other computing applications. The hex triplet to represent Prussian blue is '''003153'''.

When using the [[RGB color model]] where red, green, and blue light are added together, Prussian blue has the RGB code of 0, 49, 83

== Use as a medicine ==
Prussian blue is a [[medicine]] that is sometimes given by [[Medical doctor|doctors]] to help remove certain [[radioactive]] materials from people’s bodies.  It has been used this way since the 1960s.<ref>{{cite web|url = http://www.bt.cdc.gov/radiation/prussianblue.asp|title = Radiation Emergencies > Emergency Instructions > Fact sheet: Prussian blue|work = Emergency Preparedness and Response|publisher = Centers for Disease Control and Prevention: US Government, Department of Health and Human Services|date = 2005|accessdate = 2008-10-24|archive-date = 2013-10-20|archive-url = https://web.archive.org/web/20131020123050/http://www.bt.cdc.gov/radiation/prussianblue.asp|url-status = dead}}</ref>

== Potential use in computer storage ==
Prussian blue is a [[chemical compound]]. One of the [[chemical element]]s in this compound is [[iron]].<ref name = cbcnews/>  

Researchers have experimented replacing some of the iron [[atom]]s in Prussian blue with [[cobalt]]. When the Prussian blue compound is lit with a [[red light]] at -150 [[Celsius|C]], the compound shifts from being non-magnetic (off) to [[magnetism|magnetic]] (on). The magnetic shift does not [[:wikt:change|change]] back except if deliberately [[:wikt:reverse|reverse]]d (or undone) with [[heat]].<ref name = cbcnews/>

This magnetism is due to the transfer of an [[electron]] from the cobalt to the iron, with light providing the [[energy]], while the electron moves back when heat is applied, the researchers said.<ref name = cbcnews/>

This magnetic property means the compound can be used in [[hard disk|computer storage]]. Because the compound can be turned "[[:wikt:on|on]]" and "[[:wikt:off|off]]" in a [[control]]led way, it can remember [[binary]] information. Binary information is used for computer storage.<ref name = cbcnews/>

This way of using the compound is still being developed.<ref name = cbcnews/>

It is also used as a machinists dye to check wear patterns.

== Tones of Prussian blue color comparison chart ==
{| class="wikitable sortable" style="width:100%"
|-
!Name
!width=100|Color
!HEX Code
!Red
!Green
!Blue
!Hue
!Sat
!Lum
!Source
|-
|Dark Slate Blue
|style="background-color:#483d8b"|
|#483D8B
|72
|61
|139
|248°
|39%
|39%
|(web color)
|-
|Persian Indigo
|style="background-color:#32127a"|
|#32127A
|50
|18
|122
|258°
|74%
|27%
|(Regimental) (PerBang.dk) (Maerz & Paul)
|-
|Dark Imperial Blue
|style="background-color:#00416a"|
|#00416A
|0
|65
|106
|203°
|100%
|21%
|Imperial Blue (ISCC-NBS)
|-
|Midnight Blue
|style="background-color:#191970"|
|#191970
|25
|25
|112
|240°
|64%
|27%
|(web color)
|-
|Dark Midnight Blue
|style="background-color:#003366"|
|#003366
|0
|51
|102
|210°
|100%
|20%
|(Midnight Blue (Crayola))
|-
|'''Prussian Blue'''
|style="background-color:#003153"|
|'''#003153'''
|'''0'''
|'''49'''
|'''83'''
|'''205°'''
|'''100%'''
|'''16%'''
|'''(Berlin Blue) (PerBang.dk) (Maerz & Paul)'''
|-
|Dark Indigo
|style="background-color:#310062"|
|#310062
|49
|0
|98
|270°
|100%
|19%
|(PerBang.dk)
|-
|Gulf Blue
|style="background-color:#051657"|
|#051657
|9
|22
|87
|228°
|89%
|18%
|(Xona.com color list)
|}

==Related pages==
* [[Indigo]]
* [[List of colors]]
* [[Navy blue]]

== References ==
{{reflist}}

{{Shades of blue}}