Color correct grey hair in 100 frames

I shot a 45 second timelapse/high-speed video with talent that turns out to have grey hair that really pops in the video. Since it is timelapse his head is hardly in frame more than 5 or 6 frames in a row for a total of maybe 100 frames. I just want someone who knows how to composite to color correct his hair so it looks brown not great and there is great leeway given the speed at which it was shot (and then sped up in post).
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