In a way mate this to me is like a so called Dorathy Dix question when I looked this up on Google up comes in this order Nebular effect in cast pen blanks, Videos, Images on this subject,How does one acheive this Northern Light Effect , etc. Then a heading by your good self. I imagine those who have acheived this (in your case using Silver (real) have acheived this in some form) complete with how to,specific instructions.
I wish you well,if I had acheived success in this question perhaps I would try to stay ahead of the mob,what do you think mate? By Dorathy Dix questions this refers especially in Parliament when one party use prior knowledge to get another platform to discuss it.
You use in your claim Aurora Effect which is Nebula to me.
Have fun Fred.
Peter