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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 3956 drdavidanderson 08-Feb-18 18:08
Re: The amazing Hongshan Natural Glass Tubes 654 MDaines 09-Feb-18 11:28
Re: The amazing Hongshan Natural Glass Tubes 647 drdavidanderson 09-Feb-18 15:24
Re: The amazing Hongshan Natural Glass Tubes 652 michael seabrook 11-Feb-18 21:50
Re: The amazing Hongshan Natural Glass Tubes 624 drdavidanderson 12-Feb-18 08:32
Re: The amazing Hongshan Natural Glass Tubes 630 Apap 13-Feb-18 01:04
Re: The amazing Hongshan Natural Glass Tubes 631 drdavidanderson 13-Feb-18 05:40
Re: The amazing Hongshan Natural Glass Tubes 624 Apap 13-Feb-18 22:38
Re: The amazing Hongshan Natural Glass Tubes 609 Wheeler 13-Feb-18 12:15
Re: The amazing Hongshan Natural Glass Tubes 593 drdavidanderson 13-Feb-18 12:38
Re: The amazing Hongshan Natural Glass Tubes 597 Wheeler 13-Feb-18 13:05
Re: The amazing Hongshan Natural Glass Tubes 613 drdavidanderson 13-Feb-18 14:31
Re: The amazing Hongshan Natural Glass Tubes 602 Wheeler 15-Feb-18 03:22
Tubes and ancient themes. . . 619 Reagent 15-Feb-18 07:02
. . . Forgot to ask . . 621 Reagent 15-Feb-18 07:59
Re: . . . Forgot to ask . . 581 drdavidanderson 15-Feb-18 08:16
Fine lathing technique??? 627 Reagent 15-Feb-18 08:43
Re: Fine lathing technique??? 585 drdavidanderson 15-Feb-18 08:58
Re: The amazing Hongshan Natural Glass Tubes 584 Wheeler 15-Feb-18 11:12
Re: The amazing Hongshan Natural Glass Tubes 595 drdavidanderson 15-Feb-18 11:25
Re: The amazing Hongshan Natural Glass Tubes 599 Wheeler 15-Feb-18 11:44
Re: The amazing Hongshan Natural Glass Tubes 627 jazzmumbles 15-Feb-18 13:01
Re: The amazing Hongshan Natural Glass Tubes 837 Wheeler 19-Feb-18 02:23
Re: The amazing Hongshan Natural Glass Tubes 600 drdavidanderson 19-Feb-18 13:55
Re: The amazing Hongshan Natural Glass Tubes 591 Wheeler 20-Feb-18 20:19
Re: The amazing Hongshan Natural Glass Tubes 697 drdavidanderson 20-Feb-18 18:27
Re: The amazing Hongshan Natural Glass Tubes 672 Wheeler 20-Feb-18 20:24
Re: The amazing Hongshan Natural Glass Tubes 603 drdavidanderson 20-Feb-18 21:21
Re: The amazing Hongshan Natural Glass Tubes 661 Wheeler 20-Feb-18 21:44
Re: The amazing Hongshan Natural Glass Tubes 745 Wheeler 21-Feb-18 11:51
Re: The amazing Hongshan Natural Glass Tubes 910 pgalaxy 26-May-18 11:25


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