How they manage to dissolve text only and not themselves??

In some videos text even go over there hands but still texts dissolves and they remains intact..

Example is in this video please go through it 1st is at 4 seconds then at 1:30.

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    They probably just masked off the part of the screen with the text on it, and dissolved it. I didn't see the part you describe with the text dissolving over her hand, I was too distracted by her incorrectly calling a scalar a "constant".
    – stib
    Commented Feb 20, 2018 at 11:36

1 Answer 1


Sit behind a sheet of glass, write, flip video, key dissolve.

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    That's a pretty definitive answer :)
    – tomh
    Commented Feb 21, 2018 at 8:38
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    @tomh - Thanks. There seems to be some doubters (over a dozen thus far) whom wait for a better answer, I'd like to see what they come up with.
    – Rob
    Commented Feb 21, 2018 at 9:27
  • 1
    this is so funny ^^ Sometimes it's just a super simple solution but nowadays people think it is all edited digital :D
    – Alex Cio
    Commented May 17, 2019 at 23:36

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