Prussian blue

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Prussian blue
IUPAC name
Iron(II,III) hexacyanoferrate(II,III)
Other names
  • Berlin blue
  • Ferric ferrocyanide
  • Ferric hexacyanoferrate
  • Iron(III) ferrocyanide
  • Iron(III) hexacyanoferrate(II)
  • Parisian blue
  • 14038-43-8 checkY
3D model (JSmol)
ECHA InfoCard 100.034.418
EC Number
  • 237-875-5
Gmelin Reference 1093743
  • [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
Molar mass 859.24 g·mol−1
Appearance Blue opaque crystals
V03AB31 (WHO)
Related compounds
Other cations Potassium ferrocyanide

Sodium ferrocyanide

Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
☒N verify (what is checkY☒N ?)
Infobox references
Prussian blue
About these coordinates     Color coordinates
Hex triplet#003153
sRGBB  (rgb)(0, 49, 83)
HSV       (h, s, v)(205°, 100%, 32%)
ISCC–NBS descriptorDark blue
B: Normalized to [0–255] (byte)

Prussian blue, also known as Berlin blue, is a dark blue color that is artificially made.

It is one of the first pigments made synthetically. It was accidentally found in 1704 by two chemists in Berlin.[1]

The dark blue uniforms of the Prussian army were dyed this color.[2]

Color[change | change source]

Prussian blue oil paint thinned with turpentine.

A color can be shown by hex triplet is a six-digit, three-byte hexadecimal number used in HTML, 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[change | change source]

Prussian blue is a medicine that is sometimes given by doctors to help remove certain radioactive materials from people’s bodies. It has been used this way since the 1960s.[3]

Potential use in computer storage[change | change source]

Prussian blue is a chemical compound. One of the chemical elements in this compound is iron.[2]

Researchers have experimented replacing some of the iron atoms in Prussian blue with cobalt. When the Prussian blue compound is lit with a red light at -150 C, the compound shifts from being non-magnetic (off) to magnetic (on). The magnetic shift does not change back except if deliberately reversed (or undone) with heat.[2]

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.[2]

This magnetic property means the compound can be used in computer storage. Because the compound can be turned "on" and "off" in a controlled way, it can remember binary information. Binary information is used for computer storage.[2]

This way of using the compound is still being developed.[2]

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

Tones of Prussian blue color comparison chart[change | change source]

Name Color HEX Code Red Green Blue Hue Sat Lum Source
Dark Slate Blue #483D8B 72 61 139 248° 39% 39% (web color)
Persian Indigo #32127A 50 18 122 258° 74% 27% (Regimental) ( (Maerz & Paul)
Dark Imperial Blue #00416A 0 65 106 203° 100% 21% Imperial Blue (ISCC-NBS)
Midnight Blue #191970 25 25 112 240° 64% 27% (web color)
Dark Midnight Blue #003366 0 51 102 210° 100% 20% (Midnight Blue (Crayola))
Prussian Blue #003153 0 49 83 205° 100% 16% (Berlin Blue) ( (Maerz & Paul)
Dark Indigo #310062 49 0 98 270° 100% 19% (
Gulf Blue #051657 9 22 87 228° 89% 18% ( color list)

Related pages[change | change source]

References[change | change source]

  1. Boddy-Evans, Marion. "Artist's Pigments: The Accidental Discovery of Prussian Blue". Painting. (New York Times). Archived from the original on 2008-10-05. Retrieved 2008-10-16.
  2. 2.0 2.1 2.2 2.3 2.4 2.5 "Ancient dye could brighten computer storage". Radio Canada: January 18, 2007. Retrieved 2008-10-16.
  3. "Radiation Emergencies > Emergency Instructions > Fact sheet: Prussian blue". Emergency Preparedness and Response. Centers for Disease Control and Prevention: US Government, Department of Health and Human Services. 2005. Archived from the original on 2013-10-20. Retrieved 2008-10-24.