It can’t be erased, dissolved, or removed. It’s invisible to the naked eye and even ultraviolet light won’t reveal it. The invisible mark contains a mixture of metal oxides forming a numeric code, ...
In stores, products often carry labels such as “100% recyclable packaging”. However, the reality is different. Even recycling generates waste, consumes energy, and in some cases, its negative ...
Silver, silicon, tin, and zinc—wafers from decommissioned solar panels contain a range of metals that would be useful to separate or reuse in new alloys. Until now, however, no technology has ...