Potassium ferrocyanide (E536)

[Calyce]

I read in an old french book (Suicide mode d'emploi, histoire, technique, actualité - Claude Guillon - 1982), that it is possible to calcinate in a crucible potassium ferrocyanide in order to obtain a mixture of insoluble iron carbide and of potassium cyanide.

Here's the original text extract:
En calcinant dans n'importe quel vase, creuset, pelle à feu, pipe, du prussiate jaune de potasse qui se trouve partout, on obtient un mélange de carbure de fer insoluble et de cyanure de potassium.

I have no chemistry knowledge, so I wonder if it is true. Anyone here can confirm ?

 

[autumnal]

Sure, maybe throw in some eye of newt and toe of frog as well?

If you don't have any chemistry knowledge, I don't like your chances of being able to do this even if the instructions were valid. Surely obtaining SN would be an easier option all-round?