You install the diff color 1-2" in front of the lens , light , so you would actually sandwich the defect your looking at . A dif color sometimes makes a world of dif . I would ask that you have someone with a Hawkeye to verify its safety before shooting . 
I've got 5 bore scopes and have been using them for 20 + years , color can add a whole new dimension to determining a crater or mountain .
Your is def a odd duck , it looks like liquid metal , I use to see this in old black powder (original ) barrels when owners used Mercury to remove lead or whatever they believed it would do .
				
			I've got 5 bore scopes and have been using them for 20 + years , color can add a whole new dimension to determining a crater or mountain .
Your is def a odd duck , it looks like liquid metal , I use to see this in old black powder (original ) barrels when owners used Mercury to remove lead or whatever they believed it would do .
 
	








 
 
 
		 
 
		




