From: Katharine Thayer (kthayer@pacifier.com)
Date: 09/18/03-12:58:35 PM Z
This is a repost of an earlier post, reposted simply for housekeeping
purposes to get it into the right thread for the permanent record. It is
simply the text of my earlier comments about indigo, which make it quite
clear that the assertion that I have confused indigo (PB66) with
indanthrone (PB60) is without merit.
Katharine Thayer wrote: (September 10, 2003)
It's not entirely true
> that indigo is no longer indigo, because at least two manufacturers
> (Grumbacher and Schminke) still use PB66, the indigo that fades in blue
> jeans. While those brands wouldn't be in my short list of artist-quality
> brands, it's worth mentioning that indigo hasn't disappeared from paints
> altogether, as suggested.
>
> As Judy says, and as I've pointed out a number of times, the convenience
> mixtures now called "indigo" are mixtures of very different pigments.
> The Daniel Smith "indigo" is indanthrone (PB60) +lamp black; the Rowney
> "indigo" is pthalo blue + lamp black; the Winsor & Newton "indigo" is
> pthalo mixed with quindacridone violet and lamp black; the Maimeri and
> Holbein "indigos" are prussian blue mixed with lamp black. etc etc. This
> is why it's so important (sorry, everyone, to keep harping on this) to
> know what pigments are in the paint you use. If "indigo" has extreme
> covering power, as Judy claims, it's probably because of the lamp black
> in almost all of them, because the blues used across brands are quite
> different in covering power.
>
> When I want an indigo-like color, I prefer to mix my own by mixing
> indanthrone, PB60 (one of my favorite blues) with ivory black.
> Katharine
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