Blue marks on crank web

Jasongray5

New Member
Oct 18, 2013
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Just doing a top end on the girlfriends blaster because it had what we thought it had abit of a knock which we belived sounded like piston slap.
However, when the head and jug were off, we've noticed that there is a blue mark, on the webs of the crank, just were the rod pin goes into it.
The crank feels really good tho, she took it to the bloke who does our machining, and he reckons it could be manufacturing marks and not to worry about it? What do you guys think? Would a picture help?
Cheers Jason
 
the blue marks are from when the factory assembled the crank, no worries about them if the side to side and up/down play checks out