Complexion involved the balance of the four fundamental qualities of heat, coldness, moistness, and dryness. He believed that levels of heat, cold, moistness, and dryness would result in these differences. In his theory, memory was dependent on moistness while understanding was dependent on dryness. It adds moistness and a rich nutty taste to baked goods. They may look for threads exhibiting a vivid crimson colouring, slight moistness, and elasticity. To serve, the crust is broken and the moistness should be preserved. The sugar is hydrophilic, and also adds to the moistness of the smoked salmon. It is usually kept under some cover to preserve moistness.