Pyrolants containing magnesium and guanidinium 5-(perfluoropropyl)-5H-tetrazolate (1) and ammonium 5-(perfluoropropyl)-5H-tetrazolate (2) as oxidizers yield superior spectral efficiency compared to MTV. This is assumed to be due to the expansion of the radiating core zone with nitrogen which reduces the optical thickness in comparison to the core zone of MTV. In addition, the exothermal decomposition of the tetrazolate entity favors a burn rate that is dependent on heat feedback from the gas phase and thus proves to be a function of the flame temperature thus facilitating high burn rates at low Mg contents which is contrary to common metal based pyrolants. For part X., see Ref. [25].