Nice research Björn, it's probably not worth the hassle to reduce the amount of ash any further. 8)
You should test some ash in a flame to see if you get the nice green barium flame. Take some with you next time you have a camp fire, always amazes people to see colored fire.
Göran
You should test some ash in a flame to see if you get the nice green barium flame. Take some with you next time you have a camp fire, always amazes people to see colored fire.
Göran