Right. From my own experience, growing crystals is close to alchemy. Of course we know exactly how to do it, yet, it takes a lot of skill to grow a lot of subst

Right. From my own experience, growing crystals is close to alchemy. Of course we know exactly how to do it, yet, it takes a lot of skill to grow a lot of substances. There are a lot of detaills to the process which are difficult to capture in documentation, even if the best faith attempts are made. Add to that any variation in the machinery used. As a consequence, it is quite common in crytallography that there is a single source for certain crytals. At least in an initial phase. If a substance becomes reasonably popular, eventually more people manage to produce quality crystals. So I would expect eventually good samples to turn up elsewhere as many groups are working on this, but it can take a lot of time. Especially as no one knows what exactly was different about the Korean samples.