blue discoloration on crank gilera 172. isit a problem?

i wonder if anyone can help i have taken my cylinder off and noticed that the there is blue heat discoloration on the crank on the opposite side of the conrod journal on both sides i havent split my engine yet so dont know if my bearings are the same as i wanted to get advice on weather this is a problem as ive never seen this before please help! and if it is a problem what could be causing it? thanks

 

ive tryed uploading pictures onto here but couldnt but got some up on here http://gilerarunner.net/e107_plugins/forum/forum_viewtopic.php?175259.last

 

Im not too sure but could just be due to the heat what crank isit?

 

im not to sure ive just bought the bike and the boy i bought it from didnt know anything about bikes and it had all the work done onit when he bought it how can i tell if its a arfter market crank? there are no markings on the conrod suggesting a make

 

Ive not a clue mate best bet for the right answer for that question is probably to ask minor or terr0

 

ok mate thanks ill pm one of them

 

the image is 2 big wont let me upload them ordered a new crank from psn today anyway