《黄帝内经·素问·五常政大论》
太阳寒水在泉，则热毒之物不生，凡苦味的东西都不生，其所主之味是淡和咸，在谷类属土黄和黑色一类。
太阳在泉，热毒不生，其味苦，其治淡咸，其谷黅秬。
If the Taiyang cold water is in the spring, then the hot poison will not be born, and all bitter things will not be born, its main flavor is light and salty, and in grains it belongs to the earth yellow and black category.