Blue/green residue in SKS gas port?

[DontBurnMyFlag]

I was cleaning my gas port today after only firing about 40 rounds yesterday. I usually use gun scrubber and then scrub it out with a bronze brush. Today, I noticed some blue/green residue inside there. Is this rust? I didnt get it wet. Did it rust because of some gun scrubber residue left inside? After I saw this, I scrubbed that and the carbon out with a toothbrush, bronze bore brush and hoppes 9 solvent (RBC). It appears to have worked. Although I couldnt get all of the carbon residue off. I did a good job cleaning the gas port and the gas tube, but there is definatly still carbon in there that I just cannot get out. Should I worry about that? Any help, again, will be greatly appreciated.

 

[DontBurnMyFlag]

I was thinking about this. Could the blue/green residue be copper fouling? It makes sense as copper turns green over time. But Im still lost on what it is and what to do. And if hoppes 9 is enough to do it.

 

[DontBurnMyFlag]

Also, this may have something to do with the increased recoil I felt at the range the other day. The SKS usually has a pleasent kick to it, this time it was considerably rougher. Should I get some copper remover, rust prevention and get ALL the carbon residue out of the gun's gas port?

 

[30Cal]

Probably just hoppes getting onto small amounts of copper that get vaporized and works up into the gas system.

Ty