INSTRUCTION no. 25 TO EXAMINEES-May, 2011
25. Candidates should write the answers only in blue or blue black ink and in no other colour. Though there is no specific prohibition against the use of ball point pen, it will be advisable to use writing ink from the point of view of legibility and uniformity. Candidates are also advised not to use red, green ink, highlighter, sketch pen etc. for underlining or highlighting any sentence/para/phrase as it amounts to making distinguishing mark which is prohibited as stated in para 19 above. Candidates are permitted to use pencils for drawing graphs,diagrams etc. However,Candidates should take care not to use pencil for writing answers.
As per the instruction students are not suppose to use black pen in the examination.
Here the difference between Blue and Blue Black In side by side:
Blue Blue Black
Here the Black Ink and Blue Black Ink side by side:
Do not use Black pen in examination.