I'd like to point out that creating an address and deleting privkeys is in no way how you create a burn address. You just send the coins to an address that doesn't exist, and that doesn't materially have private keys, like
xxxxxBURNxxxADDRESSxxxxx (the length should obviously be like normal addresses.
Edit: sorry for dupe zebedee posted first.
its not just the length, it has to contain certain amount of upper and lower to be compliant, just sending to 1burnaddresforXUP394342394 will not work, the address bar will just go red and say unable to send. tomorrow i will create a new burn address and record it all for proof.