Its peak with Bonington, Friedrich, Corot and others. Decline in Impressionism to deliberate omission in ‘primitives’ such as Cézanne and Astrup.
The way that distant hills fade in contrast, detail and colour, and how their hue shifts towards cooler colours. From Antonello (1475) to Thomas Girtin.
Aerial perspective includes reduction in contrast, reduction in chroma, and colour shift towards ‘cooler’ i.e. more blue, colours. But it can be more complex.
Painting is about form, light, and colour. Here is a short summary of the practical points developed in the previous articles on colour.