Feriprussic or Ferriprussic: How To spell?
The word Feriprussic is misspelled against Ferriprussic, an adjective meaning "Ferricyanic."
Ferriprussic has double "rr" is mispronounced as "r"Remember double 'RR' in between the strings fe & iprussic which should not be misspelled with single 'R'
Wrong Spelling:  fe-r-iprussic  Correct Spelling:  fe-rr-iprussic 
Check more misspelled words of Ferriprussic to spell it correct.