The quickest way to get good results is to use the ColorMatch node.
Find regions in your image that should be black, grey, or white,
and make those the lowSource, midSource, and highSource, respectively.
Keep lowDest, midDest, and highDest at 0, .5, and 1 respectively.
If you're more of a purist, and you really just want to tweak the color temperature,
you can use the ColorCorrect node. In the first pane, Master Cor,
scroll down the buttons and choose the TMV colorspace.
Then you can adjust the temp Gain to change the color temperature.