DEFINITION: Poultice application is a method used for cleaning and treating stains or discoloration on natural stone surfaces. It involves creating a paste-like mixture using an absorbent material, such as flour, talc, or diatomaceous earth, and a chemical or solvent that is appropriate for the type of stain being treated. The paste is then applied to the stained area and left to dry, typically for several hours or overnight. During this time, the poultice mixture draws out the stain from the stone surface through a process called adsorption. Once the poultice is dry, it is removed, and the surface is cleaned and polished. Poultice application is a safe and effective method for removing a variety of stains from natural stone, including oil, grease, ink, rust, and wine stains, among others.