Perhaps, I have been away from the lab to do more than just guess, but perhaps:

Also in the copy/paste I get a little rectangle where superscript (III) was in the original.

For lower concentrations of [FeIIIOHEDTA2the solution is yellow. As concentration rises, the solution’s color turns red, due to the fact that the dimer species appears, as in reaction:

2FeIIIOHEDTA2−↔EDTAFeIII -O-FeIIIEDTA4−+H2O
(PDF) Fe-EDTA Thermal Decomposition, a Route to Highly Crystalline Hematite. Available from: https://www.researchgate.net/publication/292377228_Fe-EDTA_Thermal_Decomposition_a_Route_to_Highly_Crystalline_Hematite [accessed Jul 02 2018].