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I've gone as high as 2% with no ill effects but I suspect 4% is a stretch. I also think that the color may not really get that much more dense and Neodymium isn't cheap. A general rule is that it will lower the expansion, not raise it. That's the case with most oxides.
I had told Dudley to call you and it sounds like he did. I have no further interest in stocking my batch room. Did you get any of the Potassium hydroxide? That's useful. I got a big tub of arsenic from him some years back and a bunch of red lead. I still have it having not done any lead melts in the last year. I will likely make an enamel white before too long.
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Where are we going and why am I in this basket?
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