Methods of identifying the location and dimensions of a contaminant particle on a calibration strip comprise imaging a calibration strip comprising a plurality of channels and a plurality of pixel columns. The process involves contacting an alcohol with carbon monoxide in the presence of a nickel compound, a heterocyclic organic compound and an iodide promoter to produce the corresponding carboxylic acid. The die cutting unit is provided with at least one die cutting knife and a counter plate for subsequently making die cuts at selected locations in the planar substrate material in the region of the applied plastic film. A filling assembly is also disclosed, which mates with the valve to deliver a fluid from one side of the wall, through the valve and into a storage tank or other apparatus disposed on the opposite side of the wall.