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Here are some first attempts at color correction.
The Bisquick picture gives a shaded gray background as a reference. Based on this, I adjusted levels to get a decent grayscale. So, there is a reasonable basis for this adjustment.
In the second adjustment, I made a hue and saturation adjustment on top of the levels adjustment. This does not have any justification except my own eye.
Then, I show the same three stages for the test pattern, using the same adjustments as for the Bisquick.
Finally, a slide with people. Here it appears the hue adjustment is too strong (towards yellow) in the highlights, but the shadows on the man's face are close or a bit reddish.
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