Hii there,

Dear candidate hope you are doing well, it would be more appropriate to answer if I know which counselling or exam you are applying for. But talking about different exams, there is no such compulsion of using colorful copy, you can use black&white too. But from now on, I would suggest to keep soft copy of all the original documents after you scan them in proper format in any device or drive. It might help you in future.

All the best!!