Blue pen or black pen?

in my opinion nothing is going to happen if  a student writes exam in blue pen .

throughout our studies we have been writing in blue pen and getting xerox copy of the same without any problems.

its correct that getting xerox copy of a material written / printed in black pen gets xerox copy more clear but blue pen is also fine .

and i dont think icai has failed any student who has written exams in blue ink.

so relax and write exams in any color ink ( blue or black ) as per your convenience