For plastic recycling in particular, the plastic identification code (three chasing arrows with the number 1 to 7) informs consumers and the sorting facility what kind of plastic it is made out of ...

By embedding a microscopic change in a pattern of pixels—called an invisible bar code—on the label, software can instantly identify the package so it can be sorted and recycled correctly.

Local News Beaverton company using invisible bar codes to revolutionize plastic recycling Digimarc's invisible bar codes can be read at recycling facilities, making sorting plastics much easier.

Reusing plastic bottles with codes #1 and #2 is probably fine to do on occasion, provided you take certain precautions.

Plastic cups made of foam (plastic code 6) or polypropylene (plastic code 5) could be used,” he explained.

Two manufacturers of plastic venting systems are pushing for a national fuel gas code in the United States that requires Underwriters Laboratories Inc. certification for use in some natural gas ...