From: Dave Rose (cactuscowboy@attbi.com)
Date: 04/16/03-07:51:25 PM Z
Yes, there certainly are differences between the "same pigment" from
different manufacturers, but I'm sure we can all agree that there's a huge
difference between raw umber, carbon/lamp black, and cobalt blue no matter
what the source. Katherine's analogy is a good one and agrees with my
experience testing a wide range of pigments.
Dave in Wyoming
----- Original Message -----
From: "Katharine Thayer" <kthayer@pacifier.com>
To: <alt-photo-process-l@sask.usask.ca>
Sent: Wednesday, April 16, 2003 6:21 AM
Subject: Re: Mixing a light pigment for gum
> Judy Seigel wrote:
> >
>
> >
> > Even if pigments have the same name, even the same number, they are not
> > necessarily from the same source, or the same mine, or the same factory,
> > so that even the original "dry pigments" can vary from one purveyor,
> > and/or one lot, to the next.
> >
>
> Just because all table salt doesn't come from the same place on the
> earth, isn't purified in the same factory, isn't all boxed by the same
> manufacturer, doesn't mean you can't be fairly sure it will taste about
> the same when you put it in your stew, and that it will taste quite
> different from, say, red pepper. A particular pigment, with a particular
> number, has a particular chemical composition and as a result,
> particular properties and characteristics. There are very few
> manufacturers and purveyors of pigments in the world; the difference
> between a particular pigment from one manufacturer or another is like
> the difference between table salt labeled with the Morton's brand and
> table salt with some other brand name on it, whereas the difference
> between different pigments is like the difference between table salt and
> red pepper. As to all the fillers and extenders and whatnots, you find
> those more in the student grades and other lesser types of paint; most
> fine artist quality paints have little or none of this gunk in them and
> tend to be pure gum and pigment, sometimes with honey added to retain
> moisture, but otherwise no extra stuff.
> kt
>
This archive was generated by hypermail 2.1.5 : 05/01/03-11:59:54 AM Z CST