Not a vcry scientific or historical comment, but that Prussian Blue
was my FAVORITE Crayola crayon, and I hated that it got re-named
"Midnight."
So Wiki is probably right on this.
--Ruth Anne Baumgartner
On Feb 1, 2011, at 6:04 PM, Marie Stewart wrote:
Hi folks.
I must, respectfully, disagree with Ann on a point about the color
Prussian
Blue Prussian Blue is defined as absorbing wavelengths about
around 680 nm,
causing it to appear in visible light as approximately 700 THz.
Which is a
lovely strong blue leaning towards the violet end of the spectrum,
not to
the green/yellow end.
(Methods of Chemical Analysis, 1998)
I will agree with her that I misspoke when I said it was and
aniline dye,
its a cyanometalate. I would have been more accurate to say that
Prussian
blue was one of the first chemically synthesized dyes. Thanks for the
redirect on that one.
(navel gazing: We know that the dye was in the painters sphere in
the early
1700s (18th century), but when did it move to the dyers sphere?
Was it in
the mid-1700s, thanks to Macquer's experiments with reduction, thereby
giving an easily transportable salt? Or was it used popularly, or
rarely
before that. I'm going to go have to go research this.
Fascinating
topic.
As a nifty side note, and a easy visual reference (although I got
it from
Wikipedia, so take it with a big grain of NaCl) the midnight blue
crayon
was once colored with and called Prussian blue.
Mari
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