A combustible charcoal fuel package is disclosed which includes an outer wrapper, preferably formed from burlap or other similar woven material that encloses large pieces of charcoal material, medium pieces of charcoal material and smaller pieces of charcoal material coated or otherwise soaked in a vegetable wax to form an aggregate. The technology described herein further provides a tunable spectral filter utilizing two sets of gratings and lenses and a two-axis micro-electro-mechanical system mirror with a selectively shaped cut-out disposed within the middle of the collimated optical path. Providing a chamber with a partial wave-form shaped interior space facilitates rapid dissipation of the expansion energy of the ignition gasses to quickly quell noise produced by such expansion. The strap holding member is disposed to direct in the predetermined direction towards the gap. The method further includes performing a multiple-grid exposure to expose the target pattern on a substrate and thereby form a circuit feature pattern on the substrate. The restricted site validates the token to ensure that it is legitimate, has not expired, and has not been used before.