Ferroprusic or Ferroprussic: How To spell?
The word Ferroprusic is misspelled against Ferroprussic, an adjective meaning "Ferrocyanic."
Ferroprussic has double "ss" is mispronounced as "s"Remember double 'SS' in between the strings ferropru & ic which should not be misspelled with single 'S'
Wrong Spelling:  ferropru-s-ic  Correct Spelling:  ferropru-ss-ic 
Check more misspelled words of Ferroprussic to spell it correct.