We all know there is a serious problem obtaining black powder. All things considered I really think this forum should revise the restrictions about the making of black powder. There is no taboo or hazard with talking about making black powder. Let the forum know how you feel. Mods please...
My first cannon loads were double layer aluminum foil as recommended. Later I found one layer was good enough. I haven't had a foil fowling problem since with that single layer load.