color of something wet
Refers to the deepened or darkened color that appears when something becomes wet, such as fabric, stone, or wood.
The wet color of the rain-soaked stone pavement is beautiful.
この着物は濡れ色になると、より深い藍色になる。
This kimono turns a deeper indigo when it takes on the color of being wet.
Compound of 濡れ (nure, 'wetness', from verb 濡れる nureru 'to get wet') and 色 (iro, 'color').