Have been spending a lot of time culling images over the break. For a variety of reasons some of them have a distinctly blue cast. I spent a fair bit of time playing with some sliders in an endeavour to rectify the problem and not being particularly pleased with the results, called on Google. A natural language search revealed a simple trick in PS 4 which does the job pretty well with a menu scroll and one click of the mouse. Happily it is still an option in the current CC version.