Most DSLR photographers use auto white balance. In many cases white balance will be right or nearly right but if you shoot RAW then it is possible to change white balance to taste in RAW conversion software. The only way of shooting with correct white balance is to use 'custom' mode and taking a test shot of a 18% grey card. However if the light changes then another custom reading will need to be taken to sample correct white balance for the new light.
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