Re: pigment

From: Marek Matusz ^lt;>
Date: 11/22/05-09:38:42 AM Z
Message-id: <BAY101-F5BA890A41FF2E643E5154BB520@phx.gbl>

This question of cyanotype or prussian blue permanence has beem lingering in
literature for a while. Yet there are plenty of examples of perfetly good
looking cyanotypes from hundred years ago. I have been conducting my own
stability tests on the pigments that I am using. I t has been a couple of
months and we do get a lot of sun exposure in Texas. I will report which
pigmets do well in a few months (prussian blue from Daniel Smith is one of
the pigments tested).
Marek, Houston

>From: "Christina Z. Anderson" <>
>Subject: Re: pigment
>Date: Tue, 22 Nov 2005 07:05:29 -0700
>I'm going to throw out something here you all can hash over.
>I don't use Prussian blue just because of some brands' purported fading in
>sunlight and recovering in the dark...Maimeri, Sennelier, Schmincke, Wand
>Page says she has not seen it recover.
>Whether this is fact or fallacy, thalo works so much better with more color
>saturation and clearer and smoother. But it seems to me that this chance
>would be akin to working with Alizarin nowadays when there are better,
>permanent reds.
>----- Original Message ----- From: "Jack Fulton" <>
>To: <>
>Sent: Monday, November 21, 2005 10:15 PM
>Subject: Re: pigment
>>Yes, the 'blue' of the cyanotype is Prussian Blue. The cool thing about
>>it is that it was the first true blue that was what one might call
>>inexpensive. It came around in the early 1700's, so Herschel knew all
>>about it when developing the cyanotype.
>>One interesting anecdote for today's climate of terrorism is that Prussian
>>Blue and Potassium Iodide can be ingested to aid in the removal of
>>radioactive materials from the body. Both of these are chemicals of our
>>medium. The FDA approval of Prussion Blue is either coming up or was
>>recently approved. The U.S. is stockpiling capsules of it.
>>Jack Fulton
>>On Nov 21, 2005, at 8:49 PM, Katharine Thayer wrote:
>>>On Nov 21, 2005, at 6:55 PM, Dave Rose wrote:
>>>>Isn't Prussian Blue the same pigment/chemical that forms cyanotype
>>>Is it? I guess I've never heard or thought about what the final product
>>>is that forms a cyanotype print, but Prussian blue is hydrous ferric
>>>ferrocyanide or feriammonium ferrocyanide, is that what it is?
>>>To my eye, Prussian blue pigment has a greener cast to it than most
>>>cyanotypes I've seen, or than pthalo, which to my eye has probably the
>>>purest cyan hue for tricolor of the blue pigments available, followed by
>>>ultramarine. And to me it's a duller blue than either pthalo or
>>>ultramarine, and for those two reasons I didn't suggest it for tricolor.
>>>But I can't say for sure that it's not good for tricolor, because I've
>>>never tried it. I guess I was also influenced by someone who wrote the
>>>other day that he had tried Prussian for tricolor and it didn't work
>>>well at all.
>>>I feel another test
Received on Tue Nov 22 09:42:18 2005

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