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Additional scrumbling thoughts
When the scrumbling brush is quite dry, it deposits little points of color over the background color, much like a pointillist gone mad. Those bits of color are almost invisible to the eye. Therefore, the key to good scrumbling technique is a very dry brush and many layers until the desired effect is achieved.
Sometimes I like to scrumble a dark saturated color over a light background or a light saturated color over dark background. If the scrumbling color is a good complement, the painting begins to develop the vibrant, luminous quality that is found in many impressionistic paintings without being so obvious about how the quality is accomplished. A little advance planning is required in selecting a proper value of the background so that when the scrumbling technique is completed the final combined color value is correct.
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