Here's just one of many sources from googling "empty tea bags"
When I was using my cig paper cartridges I always kept a pair of tweezers handy to dig out unburnt paper and visually inspected each chamber before reloading.
With over 15 perCUSSIN' revolvers, I've been called the Imelda Marcos of cap & ball.
SASS#3302 (Life), SASS Regulator, NRA (Life), DGB#129
Wolverton Mtn. Peacekeepers (WA), former Orygun Cowboy (Ranger, Posse from Hell)