When there's nothing to bring me down
But what will I say
When I'm held to the flame
Like I am right now
Save through the fire with Your mighty hand
But even if You don't
My hope is You alone
To move a mountain
Well good thing
A little faith is all I have, right now
But God, when You choose
To leave mountains unmovable
Oh give me the strength to be able to sing
It is well with my soul
It has to be controlled at the right setting.
Second is the container. It's held in a proper container to make the process work. To transfer heat but not mess up the contents.
Thirdly is the person holding it. Patience is required. A steady hand is required. Not given to anger, not given to falling for distractions. Their eyes are always on the flame and the contents of the crucible.
Knowing exactly how long to wait once the silver is liquid is the sensitive part. What once was hardened is now useful in the hands of the Master craftsman. The dross is constantly removed until a purified product remains. The Master Craftsman knows it's time to bring it out only when the silver reflects His image.