>>11314641>>11314019I have grown many that are very large in size. The real secret is to insulate and let the metal "settle" proper before it crystallizes so that it has less forces destroying the newly formed crystals. This also means that volume of material will matter. You'll need at least 30-50 pounds if you want some really nice large looking crystals. Invest in a sturdy pot that can bear that weight too, otherwise disaster awaits you.
I purposefully heat it about 50-100 degrees higher (under a fume hood of course) before I scoop the slag then pour into a new clean container. The container it cools in is a wider metal bowl insulated with ceramic wool from all sides especially the top. I place all of this on the solid concrete floor in my garage and let it sit for 10-30 minutes, never disturbing it. After a crust forms on the top you can poke at it to see if it's a separate crystal or solid.
Pic related is the bottom of the bowl that hardened. Sometimes you can get nice "geodes" like that too.
>>11318993In crystal form. "Bismuth crystals".
