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Khartoum, Omdurman Market, 2006 – 2011
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Posted by: Pascal Joannes Post Reply
08/23/2012, 01:03:08

Hi there, first let me say than I am delighted to have found your forum and to receive professional advice from top notch experts like Carl or Beadiste.
Between 2006 and 2011, I have been posted in Khartoum and soon became addicted to the beads’ stands of the Omdurman market on Friday’s.
In Khartoum, the beads trade goes this way: Sudanese people come from the country side to sell old beads and to buy new beads made in Germany, Turkey, China, etc… The beads dealers sell the old beads to “kawadja”, the foreigners.
The first pictures (Omdurman Amber 1 & 2) is just there to illustrate what Musa, the leading bead trader calls “1st quality amber”, genuine natural amber that he buys by weight and sells typically by strings of 12 to 15 beads. Personally, I indeed believe Musa: genuine natural amber
The next picture (Sudanese Cherry Amber A) is my first question. These beads are also sold as “1st quality amber”, genuine natural amber by the Sudanese dealers. For the same price than the above mentioned Omdurman amber. I am tempted to believe the dealers maybe because I like a lot the beads, their shape, their color. Your input would be precious.
The third and last picture (Sudanese Cheery Amber B) is my second question. The beads are a bid too identical, their shape too regular. Genuine amber? I do not think so. Pressed amber? Copal? Phenolic/ Acrylic plastic? Here I need your help
I know that giving on opinion based on a picture is almost impossible. Sorry for that. If anybody is interested, I can forward by mail the full size picture.
Thank you so much in advance
Pascal
PS: Based on your recommendations, I conducted both the hot water and the aroma tests. The “Kerbet Ali” went through with flying colors.

Omdurman_Amber_1.jpg (37.1 KB)  Sudanese_Cherry_Amber_A.jpg (37.2 KB)  


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The darker beads look a lot like these
Re: Khartoum, Omdurman Market, 2006 – 2011 -- Pascal Joannes Post Reply Edit Forum Where am I?
Posted by: Carl Dreibelbis Post Reply
08/23/2012, 05:36:39

and these are phenolic resin, old, but phenolic resin

2_red-amber.jpg (129.3 KB)  


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BTW, the majority of these beads are hand carved.
Re: The darker beads look a lot like these -- Carl Dreibelbis Post Reply Edit Forum Where am I?
Posted by: Carl Dreibelbis Post Reply
08/23/2012, 12:56:27



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Re: The darker beads look a lot like these
Re: The darker beads look a lot like these -- Carl Dreibelbis Post Reply Edit Forum Where am I?
Posted by: Pascal Joannes Post Reply
08/23/2012, 13:27:53

Thank so much for your swift and informed answer.The interesting part is that the Sudanese dealer is deeply convinced that these beads are genuine natural amber.



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Hello Pascal
Re: Re: The darker beads look a lot like these -- Pascal Joannes Post Reply Edit Forum Where am I?
Posted by: Carl Dreibelbis Post Reply
08/23/2012, 16:27:26

Hi Pascal, I am sure the dealer is convinced they are real as they have been represented this way for years. Up until recently, almost all of the African Bead Traders I have dealt with over the years still believed they (the phenolic resin beads) were real amber. Thanks in part to this forum, those who read it discovered the differences.

Basically all of the beads shown in these two photos, sold to me thirty (or forty) years ago as "amber" are phenolic resin.

2009.jpg (79.6 KB)  3_3_amber.jpg (54.8 KB)  


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Zig-zag cut
Re: Khartoum, Omdurman Market, 2006 – 2011 -- Pascal Joannes Post Reply Edit Forum Where am I?
Posted by: beadiste Post Reply
08/23/2012, 09:13:37

The cut of the beads in your second and third pictures is a dead giveaway that they're likely phenolic resin. I don't quite know how to describe it, I just think of it as the "zig-zag" or "reverse triangle" cut - an attempt to make the beads look more nugget-like rather than like sliced cylinders. The 4th bead from the bottom right in your second picture displays very clearly the wavy edge resulting from this cut - and, once recognized, you can see it in most of the other beads as well.

The red appearance seems to be due to dye, either applied during the casting or in a bath afterward, I don't know.

The beads having this zig-zag cut generally seem to be in better condition than such examples as in Carl's photo, so I wonder if they're a few decades newer.



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The "red" color is created by heating the beads. Not dyed.
Re: Zig-zag cut -- beadiste Post Reply Edit Forum Where am I?
Posted by: Carl Dreibelbis Post Reply
08/23/2012, 12:45:59



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Not all dyed.
Re: The "red" color is created by heating the beads. Not dyed. -- Carl Dreibelbis Post Reply Edit Forum Where am I?
Posted by: beadiste Post Reply
08/23/2012, 15:25:58

I think some are, because the red color comes off if the beads are polished.



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Re: Not all dyed.
Re: Not all dyed. -- beadiste Post Reply Edit Forum Where am I?
Posted by: lopacki Post Reply
08/23/2012, 15:50:41

When buffing any type resin/plastic more than likely the color will come off on the buff, this is not from dye it is the resin/plastic melting on to the buff.

All my best ........ Danny



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Not buffing with anything tougher than a cotton swab.
Re: Re: Not all dyed. -- lopacki Post Reply Edit Forum Where am I?
Posted by: beadiste Post Reply
08/23/2012, 16:00:58



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I appear to be mistaken
Re: Re: Not all dyed. -- lopacki Post Reply Edit Forum Where am I?
Posted by: beadiste Post Reply
08/23/2012, 16:38:15

Dragged out my giant red "horse chestnut" beads - the ones that I remember producing a suspicious carmine stain - and re-tested them with Simichrome and a Sunshine polishing cloth, and this time I could not get any red color off them. They did turn the Simichrome to ochre.

So we'll go with heat treatment to turn yellow phenolic to red...although I still think the phenolic itself could be dyed during its production.



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Re: I appear to be mistaken
Re: I appear to be mistaken -- beadiste Post Reply Edit Forum Where am I?
Posted by: Carl Dreibelbis Post Reply
08/23/2012, 18:59:09

They might very well be colored now but on older beads they were heat treated to turn them red. I actually boiled yellow beads in oil in the 70s as an experiment and they did indeed darken up.



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Re: Zig-zag cut
Re: Zig-zag cut -- beadiste Post Reply Edit Forum Where am I?
Posted by: Pascal Joannes Post Reply
08/23/2012, 13:30:21

Thank you so much for your answer and your comments...Best. Pascal



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Horse Chestnuts
Re: Zig-zag cut -- beadiste Post Reply Edit Forum Where am I?
Posted by: beadiste Post Reply
08/23/2012, 16:52:03

These are the mahogany-colored beads that I thought were dyed. The yellow beads are the same cut and style of streaked resin - as with the red beads, some are more translucent, some are more opaque.

PhenolicHorseChestnuts_001.JPG (145.7 KB)  


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As much of the pile as I could fit into 169kb
Re: Horse Chestnuts -- beadiste Post Reply Edit Forum Where am I?
Posted by: beadiste Post Reply
08/23/2012, 17:01:43

PhenolicHorseChestnuts_005.JPG (165.2 KB)  


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Carved red bead with gold interior
Re: Horse Chestnuts -- beadiste Post Reply Edit Forum Where am I?
Posted by: beadiste Post Reply
08/24/2012, 09:55:02

The small bead at the join of the cord ends of the "Horse Chestnuts" strand appears to be carved into a wavy nugget simulation on one side, revealing a golden interior lurking below the dark cherry red surface.

These are not bright red beads, or even "cherry amber," but more of a rosewood color. And I still suspect they are golden inside, and that the surface has been colored somehow.

The small bead was not necessarily produced by the same workshop that produced the large beads, of course. The surface color just seems to me to be identical.

I mention all this because the cut of these beads - the reverse triangles, wavy edge - appears the same as the beads Pascal has posted. They're definitely phenolic resin.

RedPhenolic_007.JPG (40.3 KB)  RedPhenolic_008.JPG (37.5 KB)  


Modified by beadiste at Fri, Aug 24, 2012, 09:56:35

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Red color and heat and dye
Re: Khartoum, Omdurman Market, 2006 – 2011 -- Pascal Joannes Post Reply Edit Forum Where am I?
Posted by: beadiste Post Reply
08/24/2012, 09:39:37

Low light here this overcast morning, so the picture is not very vivid.
From left to right, I think we have:

Bead darkened from age - wear around circumference reveals lighter original color

Dark cherry-colored bead that seems to be that color originally, whether from colorant throughout the resin or just on the surface, I don't know

Bead that has been definitely burned - blackened and cracked, bright red created at margin between damaged and undamaged material

Another possibly heated bead - red splash is same hue as the burned bead

Bead that has been hand-carved - cannot tell if red color is original or due to careful heating. It is a sort of dull cherry red, not the bright scarlet displayed by the burned bead

The large cube looks very similar to vintage "Bakelite" carved pins that purportedly have been "resin-washed" or "overdyed." [do a Google Image search for "overdyed Bakelite," you'll see plenty of it] The rust surface is obviously only skin-deep over a golden interior. How the color was applied or created, I don't know.

RedPhenolic_003.JPG (150.8 KB)  

Related link: http://snipurl.com/24rhvbf

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