Please try to write in black pen as it scans better and it’s in the instructions. However, jetstream blue is quite dark so you it might be fine, but it’s better to be safe and use a black pen
HSC markers will always prefer black but if you don't have your preferred pen in black then forego it and just stick with what you are used to.
message taken, will write with my sad black pens thanks allIdk if they will do anything but it does say to use black pen. I've been told it's because blue is harder to see after the booklets are scanned so it's harder to mark.