Abstract: Anodized aluminum surfaces are electrolytically colored using alternating current in a process in which two different coloring baths are sequentially employed. One bath contains copper(II) ions and an additive which improves throwing power thereby providing uniform distribution of the depth of color. The other bath contains tin(II) ions, silver ions, or both tin(II) and silver ions. If tin(II) ions are included, additives which stabilize tin(II) ions and improve throwing power are also included. Either bath may be used first. The use of two separate coloring baths provides colored aluminum surfaces which have excellent resistance to corrosion. Workpieces with reddish-gold hues and darker tones can be produced.

Abstract: Stabilizer mixture for polymers based on halogen-containing vinyl monomers are provided. The stabilizers contain:a) calcium soaps of C.sub.8-32 fatty acids,b) zinc soaps of C.sub.8-32 fatty acids, andc) garnets corresponding to formula (I): ##EQU1## in which M.sup.I is at least one alkali metal ionM.sup.II is at least one divalent metal ionM.sup.III is at least one trivalent metal ionM.sup.IV represents titanium and/or zirconium ionsA.sup.n is at least one n-valent acid anion with the charge n=1, 2, 3 or 4 and the following conditions apply:0.ltoreq.x<1, 0.ltoreq.y<1, 0.ltoreq.z<12, 0<m, where y<z and n.multidot.m+z=12, wherein said garnets are optionally surface-modified.Such garnets are characterized by a specific crystal lattice which distinguishes them from other alkaline earth metal aluminates, such as the hydrotalcites.

Abstract: Oligoglycerol mixtures having a high diglycerol content are prepared by a process in which glycerol is condensed in the presence of zeolites corresponding to formula (I)M.sub.2/z O * Al.sub.2 O.sub.3 * x SIO.sub.2 * y H.sub.2 O (I)in which M is an alkali metal or alkaline earth metal having a valency of z, x is a number of 1.8 to 12 and y is a number of 0 to 8. The water of condensation which is formed during the reaction, is continuously removed from the reaction mixture and the reaction is terminated when the quantity of water theoretically necessary for the formation of diglycerol has been separated.