Glass Discussion & Research. NO IDENTIFICATION REQUESTS here please. > Germany
Conchoidal fracture (bruise) on Greta Vase
glasswizard:
Peter I would have to say if the bubble is entirely enclosed in glass then it has not burst yet. Terry
Frank:
--- Quote from: "paradisetrader" ---So it this is a burst bubble then ?
--- End quote ---
Probably. There is a slight possibility that the contaminent that caused the bubble is not one usually used that would vaporise completely, as a result it only partially vaporised and left residue - but I consider that highly, highly unlikely.
You could check it out with a 30x magnifier but that might not be strong enough. Put it back in the window and see if when hot the water forms droplets. Hmm winter.
paradisetrader:
What I absolutely want to avoid is it getting any worse Frank, as it is already promised, so I won't be trying that
I just want to learn something from it before I pass it along.
Looking again more closely with a jeweler's loop I see the whole thing is fan shaped with several fine lines describing the curve of the fan and parallel to that.
Light is reflected particularly brightly from one spot which I took to be the bubble but maybe not, or perhaps a collapsed bubble.
I am beginning to wonder if it is a "bruise", an internal crack, perhaps focussed on a point where there used to be a bubble.
I shall try to get better pics of if in the next day or two, but it's not easy as I have no macro function on my camera which would require a converter to the lens for that.
Also the fault is only clearly visible from the inside as it lies underneath a thick rib in the pattern which distorts it.
Connie:
Peter -
Try putting your camera to your loupe over the area. I haven't used theat technique myself but some others on the AB board used that technqiue when they couldn't get a close enough shot on some detail and the results were amazing. 8)
Cathy B:
Would you be able to take precise measurements, height, across the top and number of ridges in the frosted section?
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version