It usually is. You can usually find some research or news about same tech used. from 2013 article [1], though it seems not practical [2]: "W2Plastics has show

It usually is. You can usually find some research or news about same tech used. from 2013 article [1], though it seems not practical [2]: "W2Plastics has shown the viability of magnetic density separation, where flakes of shredded plastic such as polyethylene or polypropylene are mixed into a magnetic fluid made by adding iron oxide to water." I am not sure which one is better to show kids they discovered something existing, or praise them like this [1] https://horizon-magazine.eu/article/magnetic-attraction-recycling-plastics.html https://horizon-magazine.eu/article/magnetic-attraction-recy... [2] https://cordis.europa.eu/article/id/131208-sorting-plastic-waste-a-magnetic-game/fr https://cordis.europa.eu/article/id/131208-sorting-plastic-w...