Final answer:
Glazing is a painting technique in which thin, almost transparent coats of oil paint are layered on the surface of a painting to create subtle colors and luminosity.
Step-by-step explanation:
The process described in the question is called glazing. Glazing is a painting technique in which thin, almost transparent coats of oil paint are layered on the surface of a painting. This technique allows artists to build up the paint with subtle colors and create luminosity by reflecting light through the layers of paint.