Kathleen Hill - Fiber Artist
If the paper is truly densely packed, I don't know that firing one at a time will work either. An outdoor raku kiln would work as long as you can get it to climb slowly enough. Paper will start to smolder at around 400 degrees, and burn at around 480, but since it's inside the clay there will be a lack of oxygen, and it will take time for the clay itself to heat up, so you probably won't really see any action from the paper until the kiln air temp reaches 600 or more. I think the paper is just going to slowly smolder away as the kiln gets hotter, creating a lot more smoke than it would if it were loose in the kiln.