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Old 02-14-2018, 06:26 PM
Dave Bross Dave Bross is offline
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Jordan,

Strontium will help. Lithium will help a lot.

If you have Volf read up on strontium. Similar effects as lead without the toxicity.

Be very sure you have enough alumina with strontium (Volf) as in sum of 1st column in periodic table divided by eight (Labino).
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Last edited by Dave Bross; 02-14-2018 at 06:31 PM.
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Old 02-20-2018, 11:49 PM
Jordan Kube Jordan Kube is offline
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I added back half the borax from Dave's original recipe and a little bit of cryolite. I also doubled the potassium nitrate after looking at my other recipes. Small charges every 1.25 hours with a good stir in between each charge. It's looking really nice so far. We shall see.
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Old Yesterday, 06:07 PM
Jordan Kube Jordan Kube is offline
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Wow, it's gorgeous. Does exactly what I wanted. Pops right out of the furnace and has that beautiful fiery glow. It is also possible I screwed up my first melt of the 5% somehow, which has always been a thought in my head.

Added half of Dave's borax after reading boron was helpful, added .75% cryolite for same, doubled pot nitrate, pulverized the lithium with the STPP, small charges with stirring to maintain furnace temp as high as possible throughout the melt. There was only a very small patch of scum on the surface, similar in size to a patch of frogs eggs one sometimes gets. Raked off nice and easy. Gorgeous glass underneath. I suspect the patch would not have formed if I had stuck around for an extra hour after I put the last charge in to stir. Just need to adjust expansion now.

Thanks everyone!
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  #29  
Old Today, 08:02 AM
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Pete VanderLaan Pete VanderLaan is offline
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Those patches take forever to go away by themselves. If it's bubbles, I don't rake, I squirt them with a windex type bottle on straight spray.
Given Durk's suggestion regarding the formation of borates as an unpleasant side effect of the borax plus moisture, it makes me wonder if it might be better to use boric acid or anhydrous borax. The boric acid would bring expansion down, something borax really doesn't do. I tend to put the nitrates in a coffee grinder since all of that stuff is prilled now and the things are too big.

I was charging a cobalt silver opal and a copper ruby yesterday and had time to consider Volf on the subject of strontium and it doesn't really quite say it can substitute in part or whole on the calcium but it is clear to me that the less calcium the better if you don't like Apatite chunks. It was wise of you to crush the STP in the lithium. It's a favorite trick.

I haven't tried a copper ruby since I left New Mexico. Doing that with a moly is a futile exercise but with this little gas furnace I'm running now, my old 7,000 feet in the foothills formula was rather intense and a thread the size of a human hair struck very well on the outside of a clear gather, to the point that I cut the copper content in half and still have a red strike going on a punty whereas the goal was to have it strike in the annealer. Making it as a phosphate might be remarkable, sort of like those old Mother of Pearl colors Zimmermann used to make.
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