How to keyframe from colour to black & white

I am trying to do a video from present then moved to the past. So I am starting a clip from colour, then slowly it turns into black & white.
I have 2 questions:
1) How do I keyframe the above effects ?
2) Instead of using the Sepia effect, is there other effects to make the video black & white ?
Thanks

Tom Wolsky wrote:
Use the desaturate filter. Open the clip with the filter applied into the viewer and in the Filters tab keyframe the values from to go from 0 up to 100 to be fully black and white.
Thanks Tom, it works !!

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