This is one of over 4626 effects generated by Filter Forge, a Photoshop plugin that allows you to create your own filters.
This effect:
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To open this filter, you must have Filter Forge 1.0 or higher installed on your computer. If you don't have it installed yet, click here to download Filter Forge
A fairly simple workaround for the lack of a color math component. You can add, subtract, and multiply two sources.
Color Math Add Subtract Multiply