What does "prussian blue" mean?

Answer 1

Prussian blue (Preußisch Blau, Berliner Blau) is a dark blue pigment used in paints and formerly in blueprints. It has several different chemical names, these being iron(III) ferrocyanide, ferric ferrocyanide, iron(III) hexacyanoferrate(II), and ferric hexacyanoferrate. Most commonly and conveniently it is simply called PB.
The precise identification of PB was complicated by three factors: (i) PB is extremely insoluble but also tends to form colloids, (ii) traditional syntheses tend to afford impure compositions, and (iii) even pure PB is structurally complex, defying routine crystallographic analysis.
Uses
Colloids derived from PB are the basis for laundry bluing.

PB is the coloring agent used in Engineer's blue.

The formation of PB is a "wet" chemical test for cyanide. This test was a key component of the Errol Morris film Mr. Death: The Rise and Fall of Fred A. Leuchter, Jr..

PB is the pigment formed on cyanotypes, giving them their name "blueprint".

PB's ability to incorporate +1 cations makes it useful as a sequestering agent for certain heavy metals ions. In particular, pharmaceutical-grade PB (not artists' pigment!) is used for patients who have ingested radioactive caesium or thallium (also non-radioactive thallium). According to the IAEA an adult man can eat 10 grams of Prussian Blue per day without serious harm. It is also occasionally used in cosmetic products.

FOR MORE INFORMATION PLEASE VISIT:
http://en.wikipedia.org/wiki/Prussian_blue

Answer 2

It's a paint pigment that is darker than "blue" and lighter than "navy" and isn't "marine blue."
Look for it at your local art supply store.

Answer 3

It is a dark blue pigment.

You can see a sample here: http://en.wikipedia.org/wiki/Prussian_blue

Hope that helps.

Answer 4

dark blue colour

Answer 5

I looked it up on an on line dictionary..