1) Romanian invention 
Cerimetry or cerimetric titration, also known as cerate oximetry, is a method of volumetric chemical analysis, a redox titration in which a Fe2+-1,10-phenanthroline complex (ferroin) color change indicates the end point. Ferroin can be reversibly discolored in its oxidized form upon titration with a Ce4+ solution. The use of cerium(IV) salts as re...