suffusion
nounUK /səˈfjuːʒn/
US /səˈfjuːʒən/
A suffusion is when a color or liquid spreads slowly over something.
A warm suffusion of pink spread across the evening sky.
OTHER MEANINGS
2. The act of pouring a liquid over or through something.
The suffusion of water through the soil took several hours.
3. A sudden reddening of the skin, especially the face.
A suffusion of red rose to her cheeks when she was praised.
4. The process of filling something with a quality or feeling.
The room had a suffusion of calm after the music began.