Your Pripps flux is fine. As the solution cools, crystals will form.
Go ahead and spray some of the liquid on a warmed metal. It should
dry quickly to a frosty surface. Keep heating and spraying until you
have a uniform coat of “frost.” That’s what you want to banish fire
scale… or you could simply switch to Argentium or another de-ox
Judy in Kansas, where the cold frost missed my plants. Good warning
though. Time to fumigate before bringing them inside for the winter.