Recovery of In(III) and separation of Sn(IV) from leach solutions of ITO thin films. Recovery of rare earth elements from leach solutions of thin film phosphors. Separation of rare earth elements and In(III) and Sn(IV) from glass matrix elements in thin film leach solutions. Extraction chromatography on a resin impregnated with DODGAA and [C4mim][Tf2N]. Recovery and reuse of resins impregnated with DODGAA and [C4mim][Tf2N].