This is shitpost-level chemistry.
There is a pretty simple, though inefficient, way to do this in the lab by bubbling a certain toxic gas through it. There is no way of doing it at home and you will seriously hurt yourself if you try. Please do not attempt to do this. You will end up blind, missing fingers, or brain-damaged. I am so serious, this is a stupid thing to attempt. ESPECIALLY the strong acid thing I've seen around, that is an idiotic thing to do and could leave you permanently disabled. Please please please do not attempt this.
Isn't OP referring to a legitimate way of producing KCN? Decomposing potassium ferrocyanide is something that used to be reliably done (in a lab) to produce KCN. I agree that OP will probably explode if they do this without a lab or an actual understanding of chemistry and the risks of this, but it's not exactly a shitpost level reaction.
Yeah I didn't catch that at first, there's a huge difference not to mention aqueous CN will produce deadly gas.
You're referring to a real process, but this post reminds me of the saying "A little knowledge is a dangerous thing". If you went through with what you mentioned in the post you could seriously die or go blind as k1m said. If you want to consider using chemistry to produce anything you need to have actual lab equipment and a lot more knowledge on the subject. Even if you properly decomposed potassium ferrocyanide, doing it in your kitchen is basically a suicide method on its own.
