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thank you stefan. Everything is seems alright now, even though I didnt catch thoroughly the syntax. Could you possibly explain it please?

Hello guys,
I'm a brandnew latex user and I dont have any clue how to put some color in footnotes. I'm not refering at the text itself, but I want to colorize the footnote's number.
In addition, footnotes have different numerations for different chapters. I would like ti keep the same numeration for ...