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Excerpt:

Why Djoser’s blue Egyptian faience tiles are not blue?

Manufacturing Djoser’s faience tiles at temperatures as low as 250°C?

30,000 blue faience tiles were found in Djoser’s funerary complex at Saqqarah (3. dynasty). It is generally assumed that the tiles underwent a self-glazing process during firing in the range of 800-850°C or by dipping in a liquid glaze. It is striking to notice that in contrary to their labelling, numerous Djoser’s tiles are not blue but grey, black, blue-green and even brown as displayed in figure 1.

SEM microanalysis shows the presence of phosphorus in the glaze that suggests the use of the blue mineral turquoise (mafkat), an aluminium-copper phosphate, intensively extracted by pharaoh Djoser in the Sinai mines. Our aim was to replicate the self-glazing process with a soluble silicate binder (a geopolymer glaze) involving a synthetic turquoise (mafkat) mixture made of pure aluminium phosphate hydrate and copper phosphate hydrate. We were astonished to get a turquoise blue-self-glazed ceramic, stable and identical to Egyptian faience, at a temperature as low as 250°C. Post treatment at 350°C changes the blue colour into grey-black (chemical transformation of blue copper phosphate into black tenorite CuO) that remains stable up to 800°C, where it turns back to blue. Did Djoser’s ceramists use this low temperature process? Apparently yes, if we look at all the colours that we have replicated at self-glazing temperatures in the range of 250-350°C

***********

Considering the low relief/etch depth...and the repeating pattern in the Coffers you
Have presented in visual.
This suggests to me....that some are Geopolymer cast Coffers.

Numerous posts this forum on Geopolymer evidence /scientific proof....that Dynastic Egyptians were doing Geopolymer creations.

It may be that such items as Coffers** were an Investment/Prestige item...of the Elite
Or Crown Authorized Gift to favored person's.

The Geopolymer fabrication being a specialized production.


T Bird

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Troubles with the 2nd Dynasty. 5315 Thanos5150 07-Jun-16 01:34
Re: Additional Thought regarding Abydos Royal Enclosures 798 Thanos5150 07-Jun-16 02:53
Re: Additional Thought regarding Abydos Royal Enclosures 793 Warwick 07-Jun-16 15:44
Re: Additional Thought regarding Abydos Royal Enclosures 738 Graham Chase 07-Jun-16 19:14
Re: Additional Thought regarding Abydos Royal Enclosures 810 Thanos5150 07-Jun-16 21:04
Re: Additional Thought regarding Abydos Royal Enclosures 670 Warwick 16-Jun-16 18:34
Re: Additional Thought regarding Abydos Royal Enclosures 790 Thanos5150 16-Jun-16 20:52
Re: Additional Thought regarding Abydos Royal Enclosures 726 charly 17-Jun-16 17:55
Re: Additional Thought regarding Abydos Royal Enclosures 1196 Thanos5150 17-Jun-16 21:36
Re: Decoration in pyramids and mastabas 820 charly 02-Jan-17 18:48
Re: Decoration in pyramids and mastabas 1497 Thanos5150 02-Jan-17 22:56
Re: Djoser Blue Faience Tiles 899 Thunderbird 03-Jan-17 01:53
Abydos Royal Enclosures possibly are cenotaphs 706 DScribr 16-Jun-16 00:46
Re: Troubles with the 2nd Dynasty. 709 Graham Chase 07-Jun-16 13:21
Re: Troubles with the 2nd Dynasty. 875 Thanos5150 07-Jun-16 21:47
Re: Troubles with the 2nd Dynasty. 742 Graham Chase 08-Jun-16 09:48
Re: Troubles with the 2nd Dynasty. 739 Thanos5150 08-Jun-16 16:01
Re: Dynasty 1 cut and dressed 783 Thunderbird 09-Jun-16 02:44
Re: Dynasty 1 cut and dressed 2128 Thanos5150 09-Jun-16 19:33
Re: Dynasty 1 cut and dressed 752 Thunderbird 09-Jun-16 22:41
Re: Dynasty 1 cut and dressed 724 loveritas 10-Jun-16 01:11
Re: Dynasty 1 cut and dressed 832 Thunderbird 10-Jun-16 02:14
Re: Dynasty 1 cut and dressed 935 Thanos5150 10-Jun-16 18:45
Re: Property marks 710 Thunderbird 10-Jun-16 21:22
Re: Property marks 809 Thanos5150 11-Jun-16 04:26
Re: ZAG SAKH ....Serekh? 867 Thunderbird 11-Jun-16 15:08
Re: ZAG SAKH ....Serekh? 1202 Thanos5150 11-Jun-16 19:59
Re: ZAG SAKH ....Serekh? 752 Thunderbird 11-Jun-16 20:25
Re: ZAG SAKH ....Serekh? 720 Thanos5150 11-Jun-16 20:46
Re: The Sickle 755 Thunderbird 11-Jun-16 21:21
Re: The Sickle 666 Eddie Larry 11-Jun-16 23:48
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Re: The Sickle 697 Eddie Larry 12-Jun-16 02:04
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Re: The Sickle 642 Eddie Larry 12-Jun-16 04:00
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Re: The Sickle 625 Eddie Larry 12-Jun-16 04:16
Re: The Sickle 739 Thanos5150 12-Jun-16 05:07
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Re: Senedj & Seth-Peribsen 720 Corpuscles 14-Jun-16 02:58
Re: Senedj & Seth-Peribsen 978 Thanos5150 14-Jun-16 04:59
Re: The Sickle 704 Warwick 16-Jun-16 19:26
Re: The Sickle 752 Thanos5150 12-Jun-16 01:20
Re: Dynasty 1 cut and dressed 701 Graham Chase 10-Jun-16 08:32
Re: Dynasty 1 cut and dressed 754 Eddie Larry 10-Jun-16 14:08
Re: Dynasty 1 cut and dressed 661 Warwick 12-Jun-16 17:32
Re: Dynasty 1 cut and dressed 641 Eddie Larry 12-Jun-16 20:35
Re: Troubles with the 2nd Dynasty. 618 Warwick 07-Jun-16 15:13
Re: Troubles with the 2nd Dynasty. 666 Thanos5150 07-Jun-16 20:19
Books 814 Warwick 07-Jun-16 20:36
Re: Books 681 Thanos5150 07-Jun-16 21:15
Re: Books 737 Warwick 07-Jun-16 21:23
Re: Troubles with the 2nd Dynasty. 791 Thunderbird 07-Jun-16 21:59
Re: Foreign Spiritual Influence 675 Thunderbird 07-Jun-16 22:54
Re: Troubles with the 2nd Dynasty. 658 Thanos5150 08-Jun-16 04:02
Re: Troubles with the 2nd Dynasty. 786 Thunderbird 08-Jun-16 06:48
Re: Troubles with the 2nd Dynasty. 674 Audrey 08-Jun-16 16:37
Re: Ancient Symbols 855 Thunderbird 08-Jun-16 17:21
Re: Troubles with the 2nd Dynasty. 782 Thanos5150 08-Jun-16 17:30
Re: Troubles with the 2nd Dynasty. 724 Thunderbird 08-Jun-16 21:38
Re: Troubles with the 2nd Dynasty. 767 DScribr 16-Jun-16 01:01
Re: Troubles with the 2nd Dynasty. 670 Thanos5150 16-Jun-16 17:21
Re: Troubles with the 2nd Dynasty. 676 DScribr 17-Jun-16 00:58
Re: Troubles with the 2nd Dynasty. 680 Thanos5150 17-Jun-16 03:10
Re: Troubles with the 2nd Dynasty. 672 DScribr 17-Jun-16 17:45


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