Red clay gets its color from iron oxide, which is present in the soil. The iron oxide gives the clay a reddish hue. White clay, on the other hand, is usually caused by the presence of kaolin, a mineral that is light in color. The different colors of clay are a result of the varying mineral compositions in the soil where the clay is formed. **

To remove red dirt and clay from shoes, start by allowing the dirt to dry completely. Once dry, use a stiff brush to scrub off as much of the dirt and clay as possible. Then, mix a solution of water and mild detergent and use a scrub brush to gently scrub the remaining dirt and clay. Rinse the shoes thoroughly with water and allow them to air dry. If the stains persist, you can also try using a mixture of water and white vinegar or a commercial stain remover specifically designed for shoes. **

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It is not recommended to mix expanded clay and clay plant granules together. Expanded clay is a lightweight, porous material used for aeration and drainage in soil, while clay plant granules are typically used for moisture retention and as a soil amendment. Mixing these two types of materials together can result in an inconsistent soil structure and may not provide the intended benefits for plant growth. It's best to use each material separately for their specific purposes in soil composition. **

No, this is not clay. **

Clay is not inherently waterproof, as it is a porous material that can absorb water. However, clay can be made waterproof by firing it in a kiln at high temperatures, which causes the clay particles to fuse together and create a waterproof barrier. Additionally, clay objects can be glazed to make them waterproof by adding a layer of glass-like material that seals the surface. **

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To clean tennis shoes after playing on a red clay court, start by letting the clay dry completely. Once dry, use a stiff brush to remove as much clay as possible from the shoes. Next, mix a solution of warm water and mild detergent, then use a soft brush or cloth to gently scrub the remaining clay stains. Finally, rinse the shoes with clean water and let them air dry completely before wearing them again. **