Terrampulvisignis

Thank you both Tom and Min for the rabbit holes indeed. Ive managed to find materials and recipes for cone 6 that have produced some positive results.  I need to dial in holding temp and time to get more rainbows and crystals and start developing my own base to work with.  There is quite a lot of convoluted info out there actually so i think this problem is about refining the various technical threads into a smaller number of variables to pin down. One things for certain about this rabbit hole, I’m definitely in it.
side note for those who might be following:
an older book by one Sanders called “glazes for special effects” has some info including recipes with Lead and some homemade frits. Ebh pottery on instagram sells tungsten and bismuth (sisters to moly) on etsy. Theres also a wild and confusing page on the matter on puttgarden, as well as various academic papers to sift through. Again I think the problem is making sense of these various sources and refining the avenues worth testing.