In cloudy or rainy weather, picture tends to become extremely bluish or cold in tone. This warm tone filter subdues the excessive blue and renders a natural reproduction of the color."
Bob has it- there are 81 a, b, and c filters. They are called warming filters, for color photography, and the letter indicates strength. A is weakest, C strongest.
One would use them to warm colors from open shade, cloudy, or misty conditions.
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