Determine if in paint or crack?

Hii..


So i have this nice frame with what potentially could be a crack.

This was a very thin line from the beginning, tried to chip bit of with a screwdriver but dident reveal much more.



How do i go about determining this in the best way?

How much paint do i need to remove around the "hairline"?

And how do i best remove it?

Do i need to use a steel brush in the end or similar to c properly?


Thanks!



I didn't find the right solution from the Internet.



References:-
forums.thepaceline.net/showthread.php?t=215371


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