Re: Scarlet Dye (OT-II)

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From: John Edwards (edw4@mindspring.com)
Date: 02/19/02-06:46:39 PM Z

Murex purple development and value:
http://www.arts.ed.ac.uk/classics/colours/dyes.htm
----------------------------------------------------

Alejandro Lopez de Haro wrote:

> Mr. Edwards:
>
> Since we are in topic of dyes, would you happen to know, where the expensive
> blue dye came from in the Middle Age and why was so?
>
> Alejandro López de Haro
>
> ----- Original Message -----
> From: "John Edwards" <edw4@mindspring.com>
> To: <alt-photo-process-l@sask.usask.ca>
> Sent: Tuesday, February 19, 2002 10:52 PM
> Subject: Re: Scarlet Dye
>
> >
> >
> > Ruth Formanek wrote:
> >
> > > on 2/18/02 2:02 PM, Jeff Buckels at jeffbuck@swcp.com wrote:
> > >
> > > > At the suggestion of Dick Arentz in the Platinum/Palladium Book, I got
> > > > some Crocein Scarlet to spot pinholes on my negatives for pt/pd
> > > > printing. You know, the red material will mask the UV light, etc. I
> > > > was surprised to find that Crocein Scarlet comes as a powder. The
> > > > mystery I need solved is: How do I use this stuff? Anybody know?
> >
> > Is there a chance this discussion refers to "cochineal" dye?? If so, it is
> > derived from a fairly common scale insect on Opuntia (prickly pear)
> cactus,
> > easy to spot because of the soft white wax mass they secrete. Just scrape
> some
> > off and dissolve in solvent.
> > See:
> > www.bell.lib.umn.edu/Products/cochinea.html
> > http://www.arizonacactussales.com/tips/cochineal.htm
> > http://www.idrc.ca/nayudamma/carmine_49e.html
> > http://www.adf.gov/kurucochineal1.html
> >
> > - John Edwards, Vancouver, WA
> >
> >

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