Abstract: A color developer for use in a pressure- or heat-sensitive record material comprises a particulate amorphous hydrated silica/hydrated alumina composite in which the hydrated silica and hydrated alumina are chemically bound, in which hydrated silica predominates, in which the mean alumina content on a dried weight basis is at least 7.5%, based on the total weight of silica and alumina, and in which the surface area is below 300 m.sup.2 g.sup.-1. The composite may be metal-modified.

Abstract: A color developer for use in a pressure- or heat-sensitive record material comprises a particulate amorphous hydrated silica/hydrated alumina composite in which the hydrated silica and hydrated alumina are chemically bound, in which hydrated silica predominates, in which the mean alumina content on a dried weight basis is at least 7.5%, based on the total weight of silica and alumina, and in which the surface area is below 300 m.sup.2 g.sup.-1. The composite may be metal-modified.

Abstract: A color developer for use in a pressure- or heat-sensitive record material comprises a particulate amorphous hydrated silica/hydrated alumina composite in which the hydrated silica and hydrated alumina are chemically bound and in which the mean alumina content on a dried weight basis is up to 7.5%, based on the total weight of silica and alumina. The composite may be metal-modified, e.g. with copper.

Abstract: The separation and purification of palladium present in aqueous solutions which also contain other platinum group metals is accomplished by a process which involves contacting an acidic aqueous solution containing the palladium and other platinum group metals with an organic phase containing an oxime extractant and an anionic phase transfer material substantially soluble in the organic phase and substantially insoluble in the aqueous solution, and removing from contact with the acidic solution the organic phase containing substantially all of the palladium.