Liege, Belgium. June 11th, 2020. It is at the GreenMat, chemistry laboratory of the University of Liege that the magnetic beads have been developed.Vincent Delaval, is one of the three chemists behind the discovery that allowed Belgium to be the first country in the world to be totally autonomous with regard to the needs related to Covid19 testing.â¨Liege, Belgique. 11 Juin 2020. C est au GreenMat, laboratoire de chimie de l universite de Liege que les billes magnetiques ont ete mises au point. Vincent Delaval, est un des trois chimistes a l origine de la découverte permettant a la Belgique d etre le premier pays au monde totalement autonome face aux besoins lies aux testing Covid19.