Actually microwaving a CDR for a few seconds or scraping off a bit of reflective layer STILL may allow someone to read it.. All they have to do is replace the reflective layer (silver spray paint perhaps?) Not saying this is guarenteed but I would cook it longer and/or break it with a hammer, because remember on a CDR, the data is not in the foil, it's in the dye.
As far as the dye being made of cyanide, I doubt it. It's cyanine, totally different. (Just like those who think SILICON is the same as SILICONE)
Cyanine:
- Any of various blue dyes, used to sensitize photographic emulsions to a greater range of light.
- Any of various dyes that sensitize photographic film to light from the green, yellow, red, and infrared regions of the spectrum
Cyanide:
- Any of various salts or esters of hydrogen cyanide containing a CN group, especially the extremely poisonous compounds potassium cyanide and sodium cyanide
- A compound of cyanogen with a more electropositive element or group: as a : POTASSIUM CYANIDE b : SODIUM CYANIDE