Soil is the presence of a material in the wrong area. It can be visible or invisible. Winery soils can be generally categorized as organic, inorganic or combination. Winery soils can be grape based and include sugars, acids, salts, color pigments, tannins, and proteins, or they can be process based. Process based soils can originate from wine additions, microbial activity, water quality or residual cleaning agent.