A system for detecting digitized content and selecting matches from a master verification database. Dose of the ion implantation is set smaller as the depth of formation measured from the first main surface J becomes smaller. Before the web enters the nip, such an amount of processing mixture is spread onto at least one side of the web, that the processing mixture is still wet when it enters the nip. By etching away the different layers at approximately the same rate, undercutting of the encapsulated or sandwiched layer is substantially or entirely prevented. The control operates the gas valve in response to reading signals from the first and second temperature sensors such that water in the top and bottom portions of the tank stays within a desired temperature range. The dispensing system includes a removable cartridge carrier with adjustable openings and a dispenser housing that one can maintain a uniform flow pattern under different flow rates to provide for a predicable control of a dispersion rate from a dispersant located in the system and a method of predictably changing the dispersion rate of a dispersant.