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#26
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If you're into twisty cane, definitely try some of this stuff, it's wild and so much fun. |
#27
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I have not melted sulfide blacks so I'm not able to comment. Lino ran rosin blacks that were remarkable in themselves. Mine are simply chock full of oxides blotting out any color transmission. I would think Alumina is playing a major role.
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#28
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I'd be interested in hearing how it looks when you push the Gaffer durissimo that far, David. Stiff is one thing (as Pete says, alumina will get you that) but if it doesn't stay jet black at a hair's thickness....then what's the point?
Lino's rosin black was all that, but the melts he was doing at the old Manifesto facility were kind of unpredictable. Very fine bubbles would only appear in the final application, but not in the initial cane pull--occasionally. It was impossible to know if you had a good melt until you had taken it that far, but by then you were stuck with whatever you had. Lots of it went into the landfill. |
#29
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In the black that I periodically melt, I do pull the cane out into extremely fine thread and then taking two fingernails and run down the thread. If there's anything in it, including bubbles, you will feel them.
My larger question is really whether the gas is coming back out of solution or whether it's just in the finished rod as trapped gas. There's a difference. Color rod can be overworked. Making color is actually really hard when you consider the standard you have to achieve . In the final analysis, it should be dense black as Scott says, or what's the point?
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#30
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#31
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#32
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#33
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#35
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black humor
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#36
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“Once you melt black, you can never go back”. - ancient color maker saying.
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#37
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"Melting red? Better off dead." - more ancient color maker saying.
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#38
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Truth! Hahaha
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#39
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#40
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Mark talked about cad/sel reds in fluorine that started off compatible in his work and by the time he was done, they were no longer compatible. The effects of heating and cooling repeatedly in a glass does often change them. While John is really cautious about using Hagy seals to determine mismatch, those efforts can sometimes be defeated. The description of the black makes me think of those circumstances.
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#41
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I've never had compatibility problems though. Then again, the density of the color never requires more than a thin overlay or a fine cane. |
#42
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#43
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Pete, have you ever considered taking your black formula and adding alumina to stiffen it up? I mean like really stiff, like the way David is talking about working with the durissimo. I'm wondering if all that added alumina would offset the benefits of the lead base in terms of solubility of metal oxides.
I get what you and Scott are saying with the staying jet black. I think its also just as important that it stays crazy stiff. Maybe one day we could get the best of both worlds. Gaffer seemed to go the FeS route and some people complain about the color. I for one embrace the gritty warm black of it. |
#44
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Well, the leaded black is a lot more expensive to make. I'm adding lead now to keep it from devitrifying already.alumina would push back hard.
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