From: Katharine Thayer (kthayer@pacifier.com)
Date: 09/18/03-03:09:45 AM Z
Katharine Thayer wrote:
>
, and I'm sure I used pigment numbers in that post. PB60 is not
> PB66.
>
Here's my comment on indigo that Judy is apparently responding to in her
last post. I went back and looked at it carefully to see if I might
somehow have inadvertently mistyped or misspoken in a way as to confuse
indanthrone with indigo. I can't see any such typo or slip of tongue
here:
Katharine Thayer wrote: (Sept 10, 2003)
>
> I seem to have deleted the part about indigo. 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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