Apple seeds are quite "tasty" and I know a few people who eat the whole apple including the core.
The handwriting fading is true, but not for that story. A chemist wanted to find out how much HCN could be injected as a minimum dose, and he selected what he thought was well below the minimum to start. He began taking notes and failed to finish the page. I was told this by a professor in Biochem class. He said there is no safe dose when injected.
Acid mixed with Potassium Ferricyanide does NOT release the Cyanide gas. It requires much stronger treatment to get HCN from Ferricyanide.