budwas Posted August 3, 2016 Report Share Posted August 3, 2016 They used to put potatoes in the molten glass to eliminate all the bubbles. I'm thinking the starch floated and created a bearer between the molten glass and oxygen, thus preventing it from boiling and creating perossity. Like Flux on molten metal. Link to comment Share on other sites More sharing options...
Steph Posted August 3, 2016 Author Report Share Posted August 3, 2016 Oh! Interesting! Learn something new every day. Link to comment Share on other sites More sharing options...
budwas Posted August 3, 2016 Report Share Posted August 3, 2016 It took awhile to find where I read about the potato thing. American machine made marbles, page 9, Arnold Fiedler and seedy glass. Link to comment Share on other sites More sharing options...
migbar Posted August 3, 2016 Report Share Posted August 3, 2016 I could certainly be wrong, but I had heard many years ago that glass makers would put a potato in the tank of glass to CAUSE the bubbles when making seedy glass. Disclaimer : I am naturally wrong under ordinary circumstances... Link to comment Share on other sites More sharing options...
budwas Posted August 3, 2016 Report Share Posted August 3, 2016 Dang Migbar, Now I have to farther my traditional glass making education. Haha, now back to cut lines and anything else that could be mistaken for pontils. Link to comment Share on other sites More sharing options...
ManofKent Posted August 3, 2016 Report Share Posted August 3, 2016 http://bernardkatz.com/potato-in-glass/ Link to comment Share on other sites More sharing options...
budwas Posted August 3, 2016 Report Share Posted August 3, 2016 Great little video. Thanks! Link to comment Share on other sites More sharing options...
I'llhavethat1 Posted August 4, 2016 Report Share Posted August 4, 2016 I heard sometimes this occurred on the machine rollers, where two large marbles cooled and stuck together. Not really a hit mark or cold roll but anomaly. Link to comment Share on other sites More sharing options...
lstmmrbls Posted August 4, 2016 Report Share Posted August 4, 2016 Looks like 1/2 of a dumbbell defect Where one side broke off. Link to comment Share on other sites More sharing options...
budwas Posted August 4, 2016 Report Share Posted August 4, 2016 Another cut line. Link to comment Share on other sites More sharing options...
Steph Posted August 4, 2016 Author Report Share Posted August 4, 2016 Thanks for the bump. I'm still psyching myself up to gather up my cutlines and appreciate every one you deliver. Link to comment Share on other sites More sharing options...
budwas Posted August 5, 2016 Report Share Posted August 5, 2016 Another that could be mistaken for a pontil. Under magnification there is something in that hole that looks like a crystallized snow flake. There is a cutline between the red and green. The black is loaded with aventurine. Link to comment Share on other sites More sharing options...
budwas Posted August 5, 2016 Report Share Posted August 5, 2016 Link to comment Share on other sites More sharing options...
Steph Posted August 5, 2016 Author Report Share Posted August 5, 2016 Link to comment Share on other sites More sharing options...
lstmmrbls Posted August 7, 2016 Report Share Posted August 7, 2016 I have never seen aventurine in those Asian types, sounds very pretty. Are you sure it is aventurine and not debris and microfractures? Link to comment Share on other sites More sharing options...
budwas Posted August 7, 2016 Report Share Posted August 7, 2016 Istmmrbls, after closer inspection with brighter lights, yes it's silvery aventurine and lots of it. PM me and I'll be happy to send it your way. Link to comment Share on other sites More sharing options...
budwas Posted October 21, 2016 Report Share Posted October 21, 2016 Bullet mold line that goes all the way around. The spot that looks like a pontil is where the sprue was broken off. It's a cool looking marble. I'm thinking it's probably Czech. Link to comment Share on other sites More sharing options...
Steph Posted October 21, 2016 Author Report Share Posted October 21, 2016 Oooooooh Link to comment Share on other sites More sharing options...
Steph Posted October 21, 2016 Author Report Share Posted October 21, 2016 "Sprue". GREAT word. I NEED to remember that. Link to comment Share on other sites More sharing options...
J_Ding Posted October 22, 2016 Report Share Posted October 22, 2016 7 hours ago, Steph said: "Sprue". GREAT word. I NEED to remember that. Indeed. Word added! I never knew what that was called. Link to comment Share on other sites More sharing options...
budwas Posted October 22, 2016 Report Share Posted October 22, 2016 Sweet! I feel like I contributed something of value. lol I worked doing plastic injection and blow molding for 11 years. The sprue can tell a lot about what's going on. I could go on and on but I won't bore you guys. Link to comment Share on other sites More sharing options...
jeeperman Posted October 22, 2016 Report Share Posted October 22, 2016 Top right pic, the circle, it is slightly rough feels and looks like metal, can't explain it. It looks like a broke off punty but it should not be there. lol Sorry about the dusty marble. Link to comment Share on other sites More sharing options...
jeeperman Posted October 22, 2016 Report Share Posted October 22, 2016 Big over one inch slag with one big bubble pop Link to comment Share on other sites More sharing options...
budwas Posted October 22, 2016 Report Share Posted October 22, 2016 Paul, is the spot flat? Link to comment Share on other sites More sharing options...
jeeperman Posted October 22, 2016 Report Share Posted October 22, 2016 Yes, it is dead flat. You can see it a little in the bottom left pic top of marble. Link to comment Share on other sites More sharing options...
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