rockbrain
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Post by rockbrain on Jan 25, 2024 19:52:07 GMT -5
Will be trying to repeat this 2018 pour. Used a smaller hope in the pour bowl and raised the bowl higher. Somehow the glass poured in thin stream that spiraled as it accumulated and piled in the mold, it also squashed outwardly. The complete dynamics remain a mystery. Note how glass color changes after fusion: Note how colors stayed in order down pontil pipe, but note spiral landing in mold: slabs slabs closer up, more complex up close: tumbled but wet: Trying to coax rockbrain to get a glass kiln... Those are all freakin amazing, but the center left one in the last pic....As far as me getting a kiln, you better not let my wife here you talking like that!
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jamesp
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Post by jamesp on Jan 26, 2024 11:16:55 GMT -5
"Those are all freakin amazing, but the center left one in the last pic....As far as me getting a kiln, you better not let my wife here you talking like that!" Thanks for compliment. You might be surprised rockbrain, the wives love glass fusing. Used glass kilns cheaper on EBAY hint hint. So it took 10 minutes to hammer break the pieces from plate glass.(i.e. easy pour). The opaque white turns opaque pink. The opaque yellow turns opaque orange. The clear yellow turns opaque yellow. The transparent wine turns transparent blood. The motif is blood-meat-guts-bone, appropriate for spear and arrowhead makers.(I worked way thru college as a butcher) Weigh out 13-14 pounds for 11x6x1.75 inch thick brick. Ready for heat Intriguing surface colors/patterns on top of brick(suggests turbulence mixing). Sawn, 'pattern size scale' small, perfect for arrowheads and cabs. One of my all time favorites. The transparent wine and opaque pink flows very well(reaches low viscosity at melt state).
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jamesp
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Post by jamesp on Jan 26, 2024 11:30:42 GMT -5
Classic case of one glass color(the red in this case)trashing the whole project. There is some out-of-spec red glass in the batch no doubt. Irritating. see fractures when dry, it was the red that propagated all the fractures in the other colors: wet showing colors better, cracks still visible. Just goes to show that conditions have to be favorable for obsidian to not crack, it can be varying temp or chemical issues. It is actually a miracle obsidian can be formed without controlled conditions. Too bad. Those bottom ones are really nice. One single color Tela, the transparent red is a brick killer. One out of like 30 colors is all it takes. This is a shame because I must have 200 pounds of that desirable transparent red glass. It could be that one out of twenty 10 pound plates has defective composition. I will test the other 19 plates to see if they are defective. I did buy a COE 90 red plate from Wissmach(US made) at a high cost, it performs well with the Chinese glass. If buying US glass, a single brick would cost $150 just for the glass...
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jamesp
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Post by jamesp on Jan 26, 2024 11:32:41 GMT -5
Can you remelt the failures ? Hope so Patty For tumbling stock it can be re-melted Patty. Re-melt not strong enough for arrowheads. I will mail you out soon, have not forgot you
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jamesp
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Post by jamesp on Jan 26, 2024 11:53:27 GMT -5
jamesp Good looking glass bricks, even the ones that did not quite come out. Also good to see you active and posting again, your posts with pictures are always a favorite of mine. Stay busy my friend. Henry I agree HankRocks and jamespThanks Dave. We had to add on to the house, that put a wrench in the glass melting. Add Covid... I took many photos of the 2018 melts, the tricks are coming back. Documentation helped. I did use up some key colors, trying to communicate with China to re-stock the used up colors. Communication with China is like doing a Rubik's Cube in total darkness lol. A single crack across the brick is common with pouring from a bowl yielding 2 halves of the brick. Certainly these are 'coefficient of expansion' behaviors. It is a miracle to see 1000 pound boulders of obsidian without fractures throughout. Obsidian must cool very slowly and be in self annealing conditions for it to remain in tact w/out fractures. This is a miracle of nature. Note top sawed section, note pour funnel at top(two notches). Note crack that ran down and across brick yielding two solid half bricks. It takes very little poor conditions to have cracks. Conditions must be perfect. No problem with small or thin pours/melts.
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Post by liveoak on Jan 26, 2024 13:10:47 GMT -5
No worries, Jim, I was just thinking that's a LOT of glass that can be hit or miss with. Expensive experimentation !
Patty
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Post by 1dave on Jan 26, 2024 16:30:58 GMT -5
I'm getting old. Thought I posted about Chromium Chloride here, must have forgotten to hit Post. It changes color with Moisture content in dyes and Paints, I wonder what it will do in glass? Cloth: Owl Paint: Why:
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jamesp
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Post by jamesp on Jan 27, 2024 8:33:41 GMT -5
No worries, Jim, I was just thinking that's a LOT of glass that can be hit or miss with. Expensive experimentation ! Patty Thankfully the glass was obtained at the cost of hauling it off from a warehouse Patty. Sometimes it pays to have a truck and a trailer and some spare time. One man's trash is another's...
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jamesp
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Post by jamesp on Jan 27, 2024 8:46:51 GMT -5
I'm getting old. Thought I posted about Chromium Chloride here, must have forgotten to hit Post. It changes color with Moisture content in dyes and Paints, I wonder what it will do in glass? Cloth: Owl Paint: Why: Coloring agents for glass do tend to be metals Dave. Speaking of cobalt, when the glass blower heats up a load of clear glass say a 50 pound bag it only takes a dab of cobalt to turn it blue. The color travels across the molten mass rapidly which is unique(little to no mixing required). These same metals may also color agate in similar colors. Perhaps obsidian is shades of brown due to sulfur ? Red glass used to be expensive because gold was used to color it, technology has since replaced gold with a much more poisonous(at processing only) cadmium. The EPA was not fond of cadmium in process and forced glass makers to protect workers from it's fumes and rightfully so.
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Post by 1dave on Jan 27, 2024 11:32:36 GMT -5
What I'm wondering is would the Cobalt Chloride glass change color with the weather?
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jamesp
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Post by jamesp on Feb 8, 2024 15:22:06 GMT -5
What I'm wondering is would the Cobalt Chloride glass change color with the weather? Perhaps that is what causes the blue/green colored antique glass we find at old dumps ? I do know manganese rich glass sunburns to purple even if it starts out clear.
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jamesp
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Post by jamesp on Feb 8, 2024 15:31:38 GMT -5
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Post by rockjunquie on Feb 8, 2024 19:09:07 GMT -5
Those polka dots are cool as hell.
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Post by hummingbirdstones on Feb 8, 2024 20:08:54 GMT -5
Those polka dots are cool as hell. I agree!
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jamesp
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Post by jamesp on Feb 9, 2024 1:51:30 GMT -5
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Post by liveoak on Feb 9, 2024 7:24:41 GMT -5
Thanks for showing how you made the polka dots-way cool indeed !
Patty
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Post by HankRocks on Feb 9, 2024 8:01:28 GMT -5
jamesp I think I see where you headed with these "Polka Dots". After seeing the crazy money someone just spent on a very small slab of Ocean Jasper, you're trying to create your own. First the polka dots, next the hardness. Can't fool this old SE Texas boy!!
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Post by hummingbirdstones on Feb 9, 2024 8:36:00 GMT -5
Aha - rods! Very clever, jamesp.
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Post by rockjunquie on Feb 9, 2024 9:23:41 GMT -5
jamesp I think you're onto something.
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jamesp
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Post by jamesp on Feb 9, 2024 13:02:02 GMT -5
Had the rods not been had cheap that pour would have cost a fortune in orange glass rods. It used about 24 ounces of them, they are sold by the ounce. It would have turned out better if the rods were doubled in quantity. Dots can easily be made in bulk. Just spread say 1/8" chunks of broken up glass on to the shelf and melt. The red was 1/8" chunks and the yellow is 1/16" chunks. Glass just melts into balls when small or cabs when larger chunks. The tricky part is to melt the matrix surrounding the dots without collapsing the shape of the dots. In nature balls(dots) are often low flow melted/silicified in a powdered matrix which preserves the dot shape. Maybe this is the case with HankRocks ocean jasper.
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