I was shooting a subject that featured a lot of sunlight shining across a surface. In some of the photos, the sunlight appears to have a purple tinge to it. In others, the colours are more natural.
Compare this: 
f/5.6 1/125s ISO100 55mm
With this: 
f/16.0 1/60s ISO400 55mm
I'm pretty sure it isn't chromatic aberration because this isn't around the edges of the highlight area, it's the whole area. It looks like a sensor saturation issue to me.
EDIT: To clarify, I am using the same manual white balance settings for both.
EDIT: Sorry, I had put the wrong aperture and ISO for the second photo. I have corrected it now.
EDIT: I took a few photos with the camera settings as the first photo and they all had purple highlights. I also took a few at f/22 1/60s ISO800 and none of them had purple highlights. I'm guessing the difference is due to either the smaller aperture or the higher ISO.
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