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In the 8th picture from the bottom the bubbles are elongated towards the core. This would seem to indicate a mandrel or core was extracted when still somewhat molten would it not? Other cores might burn away. But this indicates man made glass of course.

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The amazing Hongshan Natural Glass Tubes 4058 drdavidanderson 08-Feb-18 18:08
Re: The amazing Hongshan Natural Glass Tubes 680 MDaines 09-Feb-18 11:28
Re: The amazing Hongshan Natural Glass Tubes 673 drdavidanderson 09-Feb-18 15:24
Re: The amazing Hongshan Natural Glass Tubes 678 michael seabrook 11-Feb-18 21:50
Re: The amazing Hongshan Natural Glass Tubes 647 drdavidanderson 12-Feb-18 08:32
Re: The amazing Hongshan Natural Glass Tubes 657 Apap 13-Feb-18 01:04
Re: The amazing Hongshan Natural Glass Tubes 660 drdavidanderson 13-Feb-18 05:40
Re: The amazing Hongshan Natural Glass Tubes 649 Apap 13-Feb-18 22:38
Re: The amazing Hongshan Natural Glass Tubes 634 Wheeler 13-Feb-18 12:15
Re: The amazing Hongshan Natural Glass Tubes 619 drdavidanderson 13-Feb-18 12:38
Re: The amazing Hongshan Natural Glass Tubes 621 Wheeler 13-Feb-18 13:05
Re: The amazing Hongshan Natural Glass Tubes 639 drdavidanderson 13-Feb-18 14:31
Re: The amazing Hongshan Natural Glass Tubes 628 Wheeler 15-Feb-18 03:22
Tubes and ancient themes. . . 644 Reagent 15-Feb-18 07:02
. . . Forgot to ask . . 647 Reagent 15-Feb-18 07:59
Re: . . . Forgot to ask . . 606 drdavidanderson 15-Feb-18 08:16
Fine lathing technique??? 652 Reagent 15-Feb-18 08:43
Re: Fine lathing technique??? 609 drdavidanderson 15-Feb-18 08:58
Re: The amazing Hongshan Natural Glass Tubes 609 Wheeler 15-Feb-18 11:12
Re: The amazing Hongshan Natural Glass Tubes 619 drdavidanderson 15-Feb-18 11:25
Re: The amazing Hongshan Natural Glass Tubes 627 Wheeler 15-Feb-18 11:44
Re: The amazing Hongshan Natural Glass Tubes 652 jazzmumbles 15-Feb-18 13:01
Re: The amazing Hongshan Natural Glass Tubes 861 Wheeler 19-Feb-18 02:23
Re: The amazing Hongshan Natural Glass Tubes 627 drdavidanderson 19-Feb-18 13:55
Re: The amazing Hongshan Natural Glass Tubes 617 Wheeler 20-Feb-18 20:19
Re: The amazing Hongshan Natural Glass Tubes 722 drdavidanderson 20-Feb-18 18:27
Re: The amazing Hongshan Natural Glass Tubes 698 Wheeler 20-Feb-18 20:24
Re: The amazing Hongshan Natural Glass Tubes 629 drdavidanderson 20-Feb-18 21:21
Re: The amazing Hongshan Natural Glass Tubes 690 Wheeler 20-Feb-18 21:44
Re: The amazing Hongshan Natural Glass Tubes 801 Wheeler 21-Feb-18 11:51
Re: The amazing Hongshan Natural Glass Tubes 956 pgalaxy 26-May-18 11:25


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