Process for the production of white melamine-phenol-aldehyde resins which are resistant to yellowing

A process for the production of melamine-phenol-aldehyde resins which are substantially white and resistant to yellowing, by the polycondensation of unsubstituted or alkyl-substituted melamine with mono- or polyhydric, unsubstituted or alkyl-substituted phenols and an aldehyde, in an aqueous basic reaction medium at a pH value between 8 and 11, which comprises adding to the reaction mixture or to the isolated dry resin one or more water-soluble ammonium or alkali phosphates or ammonium or alkali borates in an amount of at least 0.05% by weight, based on the reaction mixture or the dry resin, and subsequently isolating the resulting resin by dehydration at a temperature of at least 70.degree. C. or heating the dry resin to at least 70.degree. C.