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Old 11-26-2009, 07:02 PM
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Brad121 Brad121 is offline
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Weber Permalba black, why the 3 pigments ?

According to the following link

http://www.dickblick.com/items/00452...#colorpigments

Weber's Permalba black contains 3 pigments

* PBr7—Raw Sienna
* PBk11—Mars Black
* PBk7—Lamp Black

What do you think the reason is for their choice of pigments used in this combination?

Raw Sienna would seem to be a particularly unusual choice.

I'm interested in their reasoning and proposed benefits of this combination.
I wonder about the merits of lamp black since it's supposed to be quite a slow drier.
Does anyone know if they add a drier to help it along.

It's in no way a critical question, just interested in it's potential advantages.



thanks,

Brad.
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Last edited by Brad121 : 11-26-2009 at 07:08 PM.
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Old 11-26-2009, 08:20 PM
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sidbledsoe sidbledsoe is offline
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Maryland, USA
 
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Re: Weber Permalba black, why the 3 pigments ?

http://www.artiscreation.com/black.html
I don't see anything wrong with that and it will be still be black.
First some facts:
1-Though they are all three listed, you don't know the amounts. So the PBr7 could be a small amount.
2-Mars black dries fast, good for underpainting, is very opague, strong tinter, can vary in the shade from bluish to black.
3-Lamp black dries slow, not good for underpainting, opague, strong, can vary in shades, usually warm brown shade.
4-Artists who use black to make grays often use a PBr7 pigment to neutralize a biased black
5- Names are fickle monikers, the pigment numbers are more descriptive and that PBr7 will range in shade.
If you mix the three in the right proportion you can get a middle of the road,
drier and neutral color black that can be used for underpaintings, desaturating, whatever, because it is middle of the road.
This is my guess, only Weber knows for sure and you could call a service rep if it matters enough, good luck.

Last edited by sidbledsoe : 11-26-2009 at 08:26 PM.
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Old 11-27-2009, 04:14 PM
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boomerbeach boomerbeach is offline
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Re: Weber Permalba black, why the 3 pigments ?

Glad u posted this, I just bought a tube with great discount last week. Frankly, I've had several tubes of Permalba white sitting around and only starting using one as a "mixing white" with oils a few months ago on my PA palette. Last week, I posted that I have, at least, knocked off using WN Titanium White after not finding it white enough and started using the P White 100%. I have no reason for their choices comprising black, but non lsurprise me. I like WN Paynes Gray comprised of UMB and other stuff already on my PA palette, a good thing. I may try the P-Black today and have not had a black on my palette.
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