The pore structure of rocks and other materials can be determined through microscopy and subjected to digital simulation to determine the properties of multiphase fluid flows through the material. The processes utilize screw extruders to facilitate continuous dispersion and aggregation of toner components, such as color pigments and wax. The displaying may be achieved by providing a three axis representation of a product including in which a first axis is a representation of a process chain, a second axis is a representation of product structure, and a third axis is a representation of functional elements of the product. The digital signatures can be transmitted to a server that comprises a database of reference digital signatures and circuitry configured to compare and match the received digital signatures and the reference digital signatures. To elaborate, the method for fabricating an OLED comprising: bonding an OLED and an inorganic phosphor to each other through roll-to-roll processing is provided, wherein the inorganic phosphor is provided as a color conversion layer.