I had posed a question like this before. Is there an eyedropper tool in Premiere CC like the one in FCP (3 way color correct effect) that allows one to use an eyedropper on what should be a neutral gray or white in an image and (instantly) null out and correct for a color cast? That is to make color cast white "true white" or grey "true grey" This is how on FCP tutorial put it…
The eyedropper tool allows you to select a specific portion of your image that best represents true white, black or gray (midtone). Final Cut Pro will then readjustment the color automatically.
Note that this is not a "change color" effect that is only working on one shade of grey but rather treating the image as a whole, pulling a bad color cast out of all the greys/gamma etc.
p.s. I came across a Lynda tutorial from the wonderful Chris Meyer called "Correcting white balance issues" but it involved placing a solid layer over the clip - it's resourceful workaround but at this late date isn't there a better way with the three-way color corrector ?