Re: Scarlet Dye

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From: Alejandro Lopez de Haro (alhr@wanadoo.fr)
Date: 02/19/02-04:45:37 PM Z

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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