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Old 07-28-2019, 07:24 PM
Peter Bowles Peter Bowles is offline
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Cristalica and gaffer

I've been invited to do a couple of demonstrations at a studio that melts Cristalica. Does anyone know how well it will fit with gaffer colours and in particular the duro colours.
Many thanks in anticipation.
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Old 07-28-2019, 10:17 PM
Eric Trulson Eric Trulson is offline
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It's fine, I've done a bunch of work with cristalica as the base clear glass and gaffer colors. Rod, frit, and duro pulled into cane. Never encountered fit issues at all.
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Old 07-29-2019, 01:08 AM
Peter Bowles Peter Bowles is offline
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Excellent, good to know, thanks Eric
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Old 07-29-2019, 09:07 AM
Art Freas Art Freas is offline
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Same here, we haven't had any issues with Gaffer except their blue ice. It worked for a while then something changed and it was very incompatible. Haven't tried it again to see if it was a bad batch.
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Old 07-29-2019, 10:09 AM
Shawn Everette Shawn Everette is offline
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Ditto on the blue ice. Worked ok as surface frit for pumpkins, but the bar would craze. It's one of their phosphorus opalines, so it's prone to shift compatibility the longer you work it. Other than that I didn't encounter comparability issues.
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Old 07-29-2019, 01:29 PM
Josh Bernbaum Josh Bernbaum is offline
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Not just the opaline base, but probably the copper shifting things as well in that Blue Ice I'm thinking
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Old 07-29-2019, 02:14 PM
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Pete VanderLaan Pete VanderLaan is offline
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copper is really strange stuff. I don't think expansion follows a fixed line of adding it to a batch glass.

I've been mulling over the incompatibility issues some lately. Frank Wooley always asserted ( as did I) that the number of times incompatibility was blamed when it was likely actually poor annealing responsible that I come back to that notion.
In reality, despite my extolling the virtues of making ones own glass is really hard. Attention to detail is critical. Humidity plays hell on calculations. So do scales, so does mixing.

Earlier this year I made a bunch of tumblers and during that period I had a solenoid that keep failing unexpectedly. I'd turn and see the lehr down 400F. I could kick it and bring it back but several loads of these identical opaque cups underwent strain. As time went by, random ones were breaking in differing color combos. They had survived grinding and polishing and sat for quite some time. Some are fine. It just makes me think about annealing and putting work away too cold. Franks claims about that would get Ed Skeels frothing at the mouth.
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Old 07-29-2019, 02:26 PM
Shawn Everette Shawn Everette is offline
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There's a tech note specifically about the opaline base, don't work it aggressively longer than 30 minutes or the phosphorus with begin to precipitate causing the issues.

It's an interesting pallet of colors, but not interesting enough for me to have to deal with questionable compatibility.
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  #9  
Old 07-29-2019, 03:58 PM
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Pete VanderLaan Pete VanderLaan is offline
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A long time ago, Zimmermann made a group of rods called Mother of Pearl. That stuff was gorgeous but it didn't fit whatever we were spewing out at Pilchuck at the time.

I loved Zimmermann. That company had a real connection to a love affair with glass. Of course it failed. Why not?
Anytime you have crystals growing, collapsing and growing again is a Thelma and Louise kind of moment.
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Old 07-29-2019, 04:07 PM
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Greg Vriethoff Greg Vriethoff is offline
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I still have some crumbs of Zimmerman floating around. Gonna save it for a special occasion.
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Old 07-29-2019, 04:45 PM
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Pete VanderLaan Pete VanderLaan is offline
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I prefer "Technique is a way of finding out you can make a statement."
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Old 07-29-2019, 05:50 PM
Larry Cazes Larry Cazes is offline
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Quote:
Originally Posted by Shawn Everette View Post
There's a tech note specifically about the opaline base, don't work it aggressively longer than 30 minutes or the phosphorus with begin to precipitate causing the issues.

It's an interesting pallet of colors, but not interesting enough for me to have to deal with questionable compatibility.
When it first was released I had horrendous problems with Gaffer Alabaster. Gave up on it and haven't tried it since but I really loved the translucent qualities. I would garage the rod around 950 and usually put two lengths in for good measure. No problems working it but all of the spare unworked rods came out after annealing completely spider webbed with cracks and unusable. Never happened with any other colors.
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Old 07-29-2019, 06:23 PM
Shawn Everette Shawn Everette is offline
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Yeah, they say it's no good if left in the color box all day too. Seems like frit or quick rod work are the only way to go with it, which kind of makes it not exactly the most useful.
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Old 07-29-2019, 07:48 PM
Art Freas Art Freas is offline
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Quote:
Originally Posted by Shawn Everette View Post
Ditto on the blue ice. Worked ok as surface frit for pumpkins, but the bar would craze. It's one of their phosphorus opalines, so it's prone to shift compatibility the longer you work it. Other than that I didn't encounter comparability issues.
We had issues with Frit when it was encased as well. All the variables were the same except the batch of blue ice. Stuff would look great out of the annealer and then day by day more an more cracks.
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