Is there any accent where "cyan aide" is pronounced remotely close to "cyanide"?
Scary thing is that I used to regularly purchase a cyanide compound that could be used to produce a really nasty mixture with an acid were the two were mixed. And I also had glacial acetic acid that accidentally gave an ex a scar. Traditional black and white photography got me haz-mat shipments regularly.
(For those who don't know, potassium ferricyanide is a bleaching agent for B&W photos. It's fucking awesome so long as you rinse the print under water until the orange vanishes. But mix it with an acid, and... um... you don't want to breathe that stuff)
Edit: this is totally OT, but it's also interesting how some of photo chemistry works. I brought in some gold toner I had sitting around to a course exercise once for the other students to use. The professor, who is probably a better chemist than most people who actually work in *that* profession accidentally made the mistake of letting some of the concentrate spill on his skin. His hand had purple spots on his hand until the skin grew out because of the reaction.