Realistic hair color change

[snouffelaire]

Hello,

I need to turn hair color from blonde to dark in a realistic way in a video.
Here is a 10 seconds sample: https://www.youtube.com/watch?v=EO61_TJq4Kw
I tried many different settings in adobe Premiere and After effects (especially, selecting hue and luminance ranges and alter them) but it results in flickering.

Note 1: it seems that there are real-time filters in tiktok that do the job quite fine but they're currently deactivated (and even in that case I can't run them on video files, only camera stream)
Note 2: note that the source video is a deepfake, so it's already no-one's face (I used a generic model that's noone's face)

Thank you for your suggestions

[butterw]

It's a 2 step problem:
1) Detect hair >> generate a frame by frame mask.
2) Apply a filter to modify hair color on mask, without generating flickering.

You should post the best result you have been able to achieve. This would also help to clear up what your expectation level for "realistic" is.
Also providing a screenshot may help you get more responses.