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@stux The first bump makes sense to me, thats the slag falling off.. not sure why it "sparkles" every other time though.. .weird.
This is Mur 
@stux The first bump makes sense to me, thats the slag falling off.. not sure why it "sparkles" every other time though.. .weird.
@mur2501
Maybe, I was thinking something similar, some sort of trapped gases.
@stux