When I read about growing crystals online, I always have to think of the old 4chan "prank" that under the promise of beautiful crystals instructs the unsuspecting reader to brew some chloramine gas.
I don't know, should we? Over here, potassium permanganate became a regulated substance only about 10 years ago so I wouldn't be surprised if in 10 more years, sodium hypochlorite too stops being sold over the counter.
Now, lest this comment of mine becomes too upvoted, here is another controversial take to counterbalance it: some things can be used almost exclusively only to kill people, like guns, unlike knives. Yes, you can stab or cut someone with a knife, but you can stab or cut many other things than humans for useful and helpful effects while the gun allows you too... put small, deep holes into things from a distance, with not-so-great accuracy? At the very best, you can sit in an arm-chair with your hair-trigger and a hundred Boxer cartridges, and proceed to adorn the opposite wall with a patriotic V.R. done in bullet-pocks, but I feel strongly that neither the atmosphere nor the appearance of your room would be improved by it.
It's still alive in some form - the user database was migrated and old accounts can be accessed on the new site through a per-user token. If you had an account you may still be able to get the token and get into the new site. I haven't finished the transfer myself, though.
Safe for Work screenshot of post: https://imgur.com/IKQRKqv