The map was produced from various sources, old out of copyright Ordnance Survey maps, with more recent buildings added and aerial photographs. This was then reversed and scratched into the metal and rust printed.
Some features (rivers, roads and footpaths) were added in ink over the rust print.
The grid square was surveyed to find all the ash trees and marked onto the map. These were then marked through onto the completed rust print.
Gunpowder was placed on these locations and burnt.
90-95% of the ash tree locations were then burnt through the paper using a pyrography tool, with the remaining 5-10% (the number which will hopefully survive due to genetic diversity) had gold leaf applied.