chinese: preheat section so it doesnt blow up. let it cool so fume doesnt stick too good. blast fume in. burn it all off with super oxy flame. dont let comb cool while working on rest of piece. kiln strike at 1150(hours) 1200(one minute shots) for the nice blues.

ive got fairly specific tech for dealing with fume china in many situations just ask.

i use chinese 50x5 all the time(from mountian glass it is the best quality in chinese ive seen) its scratched and bubbles like its dirty. one in six tubes blow up. half the tubes have chipped up ends that have to be prepped for a stopper. still worth it for the fume color and cost efectiveness on mass prodo for me.