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Using blending modes
Blending modes control how each layer blends with or reacts to layers beneath it. The stencil and silhouette blending modes affect the alpha channels of layers beneath them. Other blending modes affect how colors appear when blended with the colors from other layers. Blending modes in After Effects (formerly referred to as layer modes) are identical to blending modes in Adobe Photoshop.
Blending modes cannot be animated by using keyframes. If you want a blending mode to change at a certain time, split the layer at that time and apply the new blending mode to the part of the layer that continues. You can also use the Compound Arithmetic effects, which are similar to blending modes but can change over time. (See Creating new layers by splitting a layer.)
For information on using the Compound Arithmetic effect, see Compound Arithmetic in the online Effects Help.
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