Iron(II) fumarate, also known as ferrous fumarate is the iron (II) salt of fumaric acid, occurring as a reddish-orange powder, used to supplement iron intake. Fumaric acid is the Chemical compound with the formula HO2CCH=CHCO2H Red is any of a number of similar Colors evoked by light consisting predominantly of the longest wavelengths of Light discernible by the human eye in the wavelength The colour orange occurs It has chemical formula C4H2FeO4. A chemical formula is a way of expressing information about the Atoms that constitute a particular Chemical compound, and how the relationship between those atoms changes Carbon (kɑɹbən is a Chemical element with the symbol C and its Atomic number is 6 Hydrogen (ˈhaɪdrədʒən is the Chemical element with Atomic number 1 Iron (ˈаɪɚn is a Chemical element with the symbol Fe (ferrum and Atomic number 26 Oxygen (from the Greek roots ὀξύς (oxys (acid literally "sharp" from the taste of acids and -γενής (-genēs (producer literally begetteris the Pure ferrous fumarate has an iron content of 32. 87%.