Hello aspirant,

The class 10th passing certificate should be a scanned copy of size 50 kb to 300 kb limit. It hasn't been mentioned in the NTA brochure whether the scanned copy should be a coloured one or a black and white white, so it shouldn't cause any problem.

However, still if there are any discrepancies between the uploaded documents and the specified versions of it, the NTA will notify you the same via SMS/mail.

Hope it helps!