Suffusion (noun)

1. The act of spreading a liquid or substance over a surface.
2. The spread of a color or light through a transparent surface or substance.

Origin:

Late middle english: from old french suffusion or late latin suffusio(n-), from suffundere 'to pour over'.

Examples:

1. The suffusion of blood to the cheeks indicated that she was embarrassed.
2. The suffusion of light through the stained glass window added to the beauty of the church.
3. The suffusion of water on the fields helped to nourish the crops.
4. The suffusion of oil on the water was a sign of a nearby spill.
5. The suffusion of paint on the canvas created an interesting effect.