"ian field" wrote

With cored solder the solder is applied simultaneously with the flux - not
after the flux has burned as you mischievously suggest.

I suggest you try to find a topic you know squat about to criticise!

You are the one that said flux burns.
I am the one that said if you do it RIGHT, it does NOT burn......regardless
of the source, paste or core or flowing in a machine.

Screw you. I have probably done and supervised more solder joints in my 40
year career than you have seen or imagined.