The capillary-crystallization interaction of potassium-bearing components of a glass batch are investigated. A comparison with similar dependences for sodium-bearing components is performed. New regularities related to different solubility of components, which have not been described before, are considered. In particular, a positive effect of alkali metal sulfates, which are commonly used to accelerate the glass-melting process, on fixing the batch components is demonstrated. The behavior of the capillary-crystallization curves is analyzed for solutions of different components.