The paper deals with the possible application of various methods to follow the course of reaction between zinc oxide and Fe(III)
oxide with respect to various kinds of Fe(III) oxides used (Fe(III) pigments - red, yellow and black). Differential thermal
analysis and chemical analysis can be recommended as the most suitable methods for following reactions leading to spinel formation.
The possibilities of determining the activation energy of the studied processes are discussed. When Fe(III) red pigment is
used as a reactant and therefore no reaction occurs except spinel formation, conductometric thermal analysis was found to
be suitable and more sensitive for the evaluation of differences in reactivities.
It has also been observed that the kind of Fe(III) pigment, due to its individual reactivity significantly affects the colouring
properties of the final product (e.g., of the ceramic stain).