Mike;
I have tried taking pix but they don't show much.  The blue flame arcs are thin looking not a bright blue.  But they do contain allot of heat as I put a piece of paper with it glued to a insulated screw driver and it catchs fire instantly!  Might take a real dark room to see it better on a picture-I'll work on it.  The arc to a screw driver is 3 inchs long and hisses like a snake!   I got too close to one of the loading coils with my wrist.  Gave me a bad burn but didn't hurt real bad but took three months to heal!  It was on one of the first series coils so voltage wasn't that high yet.  My loading coils are setting on the operating table here select them for 73 thru 500 bands.