Shalini, It is important to have signed it in black and then get it scanned and upload. But if you have uploaded it in blue, as long as it follows the size guidelines, you should be fine. Or else, NTA will notify you asking you to change it and you can change it during the correction window.

It is important to have signed it in black and then get it scanned and upload. But if you have uploaded it in blue, as long as it follows the size quidelines, you should be fine. Or else, NTA will notify you asking you to change it and you can change it during the correction window.