The trouble is when you start messing with WB and tint your eyes get accustomed to the new setting and you can 'forget' what is normal, i.e. your eyes deceive you. I've sometimes edited a pic thinking it was OK and then when I've gone back to it the next day the temp/tint's well off
I do have a reference photo now though so can compare to that
very true, but on the flip side when I've used auto the temp/tint can sometimes change from shot to shot, so I'd rather have a consistent WB over a period of time (say an hour).
How do you change WB if not through the slider?