Writing in water using an ion-exchange bead as a penalexanderrogge (39)in #microbead • last year Mainz University - Writing in water using an ion-exchange bead as a pen: https://phys.org/news/2023-08-ion-exchange-bead-pen.html #Microbead #IonExchange #Ions #WritingOnWater #Physics #ionexchange #ions #writingonwater #physics