Just completed a "batch run" of 24 sheets of A4 BTP. Having established a baseline with previous efforts, just looking to address any "production" issues when doing a batch. Could be anything from variability of burn rate to improving the actual handling, drying etc. The recent hot weather was a bonus of course. Once I find another hour I'll update on "findings" I note some old pyro used the BTP paper minus the oxidizer for finishing the top part of the device. The BTP itself was used as expected. This gave a device with a large area of BTP colour at the top part - rather jolly. Think some mines were finished like this.