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Hi Paul
Usually you only get a colour cast with the more budget end of the filter market but you can also get it when you stack more than one filter infront of another , if you can tell us what make of filter you're using and how you're using them we may be able to help a bit more .
The other way of dealing with colour cast is in PP rather than adjusting your white balance , most image editing programs should have some kind of correction option .
Mark
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