Twelve Photo Filters.
The Action creates 12 layers with a different coloured filter in each, they are preset to Density at 80%, Opacity at 100% and Blend Mode Normal – each of these may be modified to suit your individual needs. The presets mimic putting a coloured filter in front of a lens to adjust the colour balance / temperature of the transmitted light. They can be especially effective with B/W images.
Those at the red end of the colour wheel will add a warming touch, those at the blue end a cooling touch whilst experimenting by switching on 2 or more filters can often have interesting results.