(Unfortunately, I have chosen to remove this content due to unchecked behavior by others on this board. Moderators may humor it because it comes from their "friend", but I will not. My apologies to those who will not benefit from it in the future.)
(Unfortunately, I have chosen to remove this content due to unchecked behavior by others on this board. Moderators may humor it because it comes from their "friend", but I will not. My apologies to those who will not benefit from it in the future.)
RSC is correct. In machine-mades - bubbled glass is over-heated glass.
Glass heats and cools much slower than air. That does not mean that the glass will have unhealed stress in it. Some contemporary makers create pieces with large air inclusions in them:
..
I see spots, some twisting, red and depth in the marble - so that would make it a Submarine Guinea Cyclone Oxblood Flame.
Are those sparkly reflections Lutz AND aventurine?
I don't know that there is any specific point here - other than noting that color frit on onionskins is pulled to thread shapes as they are necked down from the cane with a pair of jacks. This is pretty universal due to how cane marbles are made with frit - and that the pontils have a clear window into the marble. Any viscous material will pull to a point - and hot glass is no exception.
They aren't "flames" - they are simply ends of frit that are stretched at the pontils.... just like every other onionskin. This one was possibly an end of cane - so the color is stretched a bit more.
Hard to say for certain without having it in hand - but the surface does look polished/buffed.
Lack of a pontil mark because it was a special "show sulphide"? Sorry - but thats just baloney.