The rheological behavior of glaze suspensions has to be closely controlled to obtain an adequate final product. In this work, we have studied glaze suspensions produced with a range of industrial frits. The main objective was to establish a correlation between changes in rheological behavior with aging and modifications in the ionic composition of the liquid phase, as a consequence of frit dissolution. Suspension rheology was followed through flow and dynamic oscillatory tests. It was found that frits releasing Ca2+, B3+, and Pb2+ can pose handling problems. To better understand the effect of cations' presence on glaze rheology, industrial glazes were compared with simulated glazes produced with inert silica and several cations. These suspensions reproduced the behavior of the industrial glazes and may be used in the future in stabilization tests.