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I think it will be way high on expansion and streaky. In my own formula, I need to add silica to bring the expansion down and I use a good deal less zinc, and tin.
In my class, we just took21 lbs of SP color base and added 60 grams of zinc 60 grams of copper red and sixty grams of black tin and 100 grams of silica. We hit red on the first try and it fit
I genuinely don't understand the insistence on trying to get white tin to do the job of black tin. they are as different as night and day, not to mention that white tin really does not melt well.
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