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Prussian blue facts for kids

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This box shows the colour Prussian blue.

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

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

The dark blue uniforms of the Prussian army were dyed this colour.


Prussian blue
Prussian blue oil paint thinned with turpentine.

A colour 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

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.

Potential use in computer storage

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

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.

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.

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.

This way of using the compound is still being developed.

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

Tones of Prussian blue color comparison chart

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)

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See also

Kids robot.svg In Spanish: Azul de Prusia para niños

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