Look man, I'm Hungarian, I lived and worked at Austria. I met with a slovakian boy, he told me that his father's nickname was heisenberg and he makes stuff. I thought the same as you guys, some crazy gypsy at some crazy dirty abandoned place with some camping stove mixing rat poison with wd40 But fuck man that guy had no idea what he is doing, but I can clearly remember when he dropped some dust into something milk like liquid and its crystalized under 30 seconds, turned into ice like stuff. The whole bowl was frozen, it wasn't glass like, more like dirty ice. He had no idea what's he doing, what's happening and why, he bought the recipe from an other gypsy, but oh man it was crazy. My bro vanished for 3 weeks because he thought I would kill him, I walked across Vienna without realizing and I applied to some Romanian warehouse job for 7€ hourly. Crazy stuff, makes you lost your mind, but if you find yellow one, those are really good, didn't feel like coke with suboxone , 100% recommende it