Polymers are highly prized by industry and increasingly used as replacements for metals in the manufacture of e.g. automobile parts and firearms. Such parts are marked with serial numbers, for security and traceability purposes. The numbers may however be partially or completely erased, and although there are techniques for recovering them from metal parts, this is not the case for polymers.
from Engineering and Construction News – ScienceDaily https://www.sciencedaily.com/releases/2017/11/171101160805.htm
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