This type of gray underpainting is referred to as Grisaille.
- Grisaille is commonly described as technique used in painting. it is often done by an image being drawn or painted wholely in shades of gray and usually severely made to give the lookalike of sculpture, in terms of relief.
- In French, grisaille is very important and common and it means any form of painting technique where transparent oil colours are put on a monotone underpainting.
Conclusively, we can therefore say that the type of gray underpainting is referred to as Grisaille.
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