OK, maybe my comments didn't come out exactly as I intended, but that's a of an overreaction, Sam.
My point was meant to be that, in my view, you don't need to use lead nitrate when making touch paper. We all know that pyrotechnic experimentation involves the management of a wide assortment of risks. But why include something - particularly if it is both poisonous and polluting - if it isn't necessary for the effect?
That thread you refer to makes interesting reading, but it isn't exactly conclusive as to whether PbNO3 really was actually ever used. I also note that, further down the thread, a solution of 1 oz. KNO3 in 1 pint of water is suggested. That's about a 5% solution, which is way below being saturated - and fits pretty much exactly with what I found to be most effective when I experimented with making touch paper out of sheets of kitchen roll all those years ago. With a solution of that strength, I never had a problem with the formation of visible crystals - except, perhaps, very occasionally on the extreme bottom edge of a sheet when it had been hung up to dry.