Scumbling:  A  scumble is a thin, lighter color applied over a dried darker color. 

The effect of a scumble is that the resulting color is brighter, more opaque and optically bluer.
Adrian Gottlieb

See: Wetcanvas Glossary, "What is Scumbling?"  

Click here for more on scumbling from Methods and Materials of Painting of the Great Schools and Masters by Sir Charles Lock Eastlake .
From: Notebooks

GottliebStudios.com/Classical_Glossary

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