Liver... its bloom is in the nails

From the line of Plain Questions (素问 sù wèn, liù liú zàng xiàng lùn) that states, The liver... its bloom is in the nails. Bloom means the outward manifestation of glory. The phrase reflects the observation that when liver blood is abundant, the nails are red, lustrous, and healthy. When liver blood is insufficient, the nails are pale in color and brittle.