Ever since taking Raul Touzon’s workshop I almost never shoot using auto white balance (AWB). The camera rarely gets the white balance correct when it guesses, and the photos from a single shoot are often inconsistent in color when they are shot with AWB. If they are going to be “wrong” when AWB is used, you might as well guess wrong yourself by choosing one of the manual white balance modes — at least the images will be consistent with each other.
Ideally one would shoot an image of a gray card (or a similar type of product) which has a known color and use it either to set a custom white balance in the camera or to sample it in software to do an automatic adjustment. If I don’t use a gray card, I pick a WB mode (my default is “daylight”) and shoot everything with that. In Lightroom I either sample a white point to fix up the WB or I adjust it to taste (I might even want to make it wacky here and there).
The shot above was snapped in the kitchen while I was testing my newly-repaired camper. Canon had changed all my default settings of course and I don’t even remember what WB was set in the camera. No matter, I simply used the WB eye dropper to sample one of the white polka dots on my daughter’s dress. The image above is the result — straight out of the camera except for the white balance.