Why is it called browning plaster?

Browning plaster is called so because it is typically a brown-colored base coat used in traditional plastering systems. This color comes from the natural materials and pigments used in the mix, primarily gypsum and sand. It serves as a foundational layer that helps create a smooth surface for the finishing coat, known as "skimming" or "finishing plaster." The term "browning" refers to the initial stage of the plastering process, where the plaster is applied to walls and ceilings.