Sorry I ant include exact dates as I'm at work and it's a hassle to look it up 
on my phone! 

Indigo dyes were around for a long time. However, they were made from extracts 
of plants. This process was extremely costly for the plants themselves, it took 
multiple baths in the he in order to reach that deep rich color that was 
desires. Because of this expense, only the upper class, nobility and the clergy 
were able to afford garments in these colors. I also believe that that dye was 
by colorfast. 

In the 1760's, the first synthetic dyes were discovered, though it took tip 
about the turn of the century till the process was refined. Because it wa now 
synthetic, the lower classes could finally afford garments in this color range.

Again, while I cannot pinpoint my sources by memory, I had looked into this 
last spring while costuming the musical Sweeny Todd where the director wanted a 
vibrant purple waistcoat for Pirrelli's character. Because of the year it was 
set, there was no way He could have afforded that color but unfortunately my 
research went unheaded.

Michael Deibert
OAS AAS LLS
Sent from my iPhone

On Feb 1, 2011, at 18:04, Marie Stewart <maric...@gmail.com> 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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