There is no especial limitation on the iron compound if it is a compound containing {HEAD ~ an iron atom} in {TAIL ~ its molecule} and is soluble in the aforementioned reaction liquid 
There is no especial limitation on the iron compound if it is a compound containing { HEAD ~ an iron atom } in { TAIL ~ its molecule } and is soluble in the aforementioned reaction liquid
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH