A process is provided for making -epigallocatechin gallate by subjecting a green tea extract to chromatography on a macroporous polar resin, eluting EGCG from the resin with a polar elution solvent, optionally concentrating the eluate, optionally regenerating the resin by desorbing the remaining catechins, and optionally concentrating the desorbed catechins. Specifically, a method of operating a take-up frame is disclosed which includes reading a force indication, wherein the force indication is obtained and provided through mechanical means. The method further includes adding a first record to the called class file table having both the first class name and the first version number associated with a second class file, and retrieving a second class version dependency file associated with a third class file. In the case of a stand-mounted scanner, a test is performed to ascertain whether or not the scanner is in its stand, and the method will only proceed once the scanner is resting in the stand.