cumulo/cumulus (Latin) – to heap, surplus
pestis (Latin) – destruction
pigmentum (Latin) - pigment
A Cumulopestis pigmentus cloud is a dark, gritty cloud, formed by the build-up and wiping of dark matter, composed of oil and pigment as opposed to water and air.
The act of painting is a continuous and exasperating cycle of forming and destroying, adding and removing, building and erasing, accumulation and evaporation. It is the heaping of pigments and the foreseeable destruction thereof.