I find that Iridium is a pain in the butt to find. I'd really like a recipe to transmute, say, 5 Gold bars to 1 Iridium bar. It would really be helpful for my plans of having iridium sprinklers everywhere.~
I found the best way to get mad Iridium, is drop like 500K into geodes from that desert store, and open them in a spree at the blacksmith. You can get 50+ I know this a request for the mod itself. Just letting you incase you didn't already
No problem, you get anywhere from 80K to 120K back in gems, aswell as topping off your gunter turn ins from geodes
Another thing people are doing to try and rack up some Iridium is to go in and out the first floor/two floors of the Skull Cavern over and over. You're bound to find some eventually.
That would take a huge amount of pretty boring grind. It would be more fun just to run the last bit of the mines, stock up on gold and then convert it to iridium. 25 iridium just for the tools. That would be 125 gold bars with "my recipe". Actually mining would probably be more fun than rng manipulation.
According to the wiki, on wednesdays. Also, I just tried it and I can confirm, it is indeed on wednesdays.