<< I assume that not all cyanide compounds are equally poisonous. >>
Yes, I understand that not all cyanide compounds are poisonous, but some
compounds, when combined with strong acid, will have reaction and release the
poisonous gas.
I have been wondering whether phthalocyanine blue is a cyanide compound. If it
is, it certainly is not poisonous because it doesn't have any special warning
label.
Dave