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Old 07-08-2019, 08:05 AM
Pete VanderLaan's Avatar
Pete VanderLaan Pete VanderLaan is offline
The Old Gaffer
 
Join Date: Apr 2002
Location: Chocorua New Hampshire
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I think your main problem is the calcium in the SP87. I mix using strontium and barium and could probably get rid of the strontium. I just rarely make the stuff.

As to the mang purple, does the SP base have antimony? I think not. It functions two ways going from the tri to the penta and also the mono valences accomodating both redox reactions. The O2 is not friendly to the color and in sp it would tend towards the brown. Gold would be better.

I think Dave's formula is a good place to start and then adjust it.

The viscosity on the copper is not particularly consistent. As the temp drops, it goes through some very fluid stages. I always had a hell of a time with fluorine blues making it into bar. I can normally pull a very consistent rod at 18 inches. Not with that stuff.
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