I want to come in here. I spent and did enamelling for around 7 yrs
Most of my enamels were purchased from Schauer. Et Cie in Vienna.
And, I still have all of them here.
I found for my way of enamelling, I used the sifting technique, no
wet packing, and Schauer supplied all my transparent powders in 80
mesh size. This worked fine, however it all depends on how you enamel
your metal, whren doing cloisonne i dsid do wet packing, on large ie,
say 12in sq copper plates it was sifting.
You need to do what delivers the results you seek.
Schauer make a very high leaded transparent enamel. I developed this
in a deep technique on fine gold and and silver to good financial