From white to black gradient watercolor

Quick answer：

A gradient watercolor refers to a painting technique where the color transitions from white to black in a smooth and gradual manner. Watercolor is a painting medium that uses a thin, transparent, and fast-drying pigment suspended in water. Artists use varying degrees of water and pigment to create a wide range of textures and effects. The gradient from white to black in watercolor can be challenging but is often used to create dramatic or abstract compositions.