Fibers with chemical markers used for coding

A method for characterizing a fiber sample wherein the fiber sample comprises fibers,

• wherein the fibers comprise identification fibers,
• wherein the identification fibers comprise 1 to 100 chemical markers,
• wherein an amount of each of the chemical markers, based on a weight of the fibers, is defined as a chemical marker amount,
• wherein at least one of the chemical marker amounts corresponds to a taggant chemical marker amount, and
• wherein (i) the chemical markers and (ii) the at least one taggant chemical marker amounts are representative of at least one supply chain component of the fiber sample, and
• wherein the method comprises:
• (a) dissolving the fiber sample in a solvent to produce a sample solution and/or insolubles;
• (b) analyzing the sample solution and/or the insoluble to identify the chemical markers and each of the chemical marker amounts.