Hello all! I had a question about my coil build. I am using dual stainless steel claptons made of 24ss/36ss gauge 316L stainless steel. I have noticed after vaping it for a while and after dry burning it to get the hot spots out, it turns kind of a funky color. I don't know if it is rust or it is gunk buildup. My juice is a yellowish color but I've been vaping on these for almost a week now. Is this color normal? Thank you so much!