The Multiply Mode
The Multiply mode is used most often with digital artists. This is because it makes white areas of the layer "transparent" but keeps the black areas opaque. This makes it the ideal selection for something like a scanned ink image. By setting the scanned image to Multiply, digital colors can be applied beneath the line art to finish the illustration. Multiply also makes colors darker by combining them with the colors below them. This makes the multiply mode ideal for shadow layers.
Purple is a very popular color to shade with. In the following screenshot, the purple layer is set to the Normal blending mode and no mixing is going on with the flat colors beneath:
The purple shadows are just sitting on top of the base colors ...
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