TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The temporary stabilizer can be removed by pyrolysis at up to 250 degreesC. It can be removed by breaking the glycosidic bonds in the presence of acids or alkalis. The aqueous solution has a pH-value of 5-8. It has a total chlorine concentration of less than 100 ppm.Preferred Metal: The nanoparticles contain at least one noble metal from platinum, palladium, rhodium, iridium, ruthenium, osmium, gold or silver and optionally at least one base metal from iron, cobalt, nickel, copper, titanium, vanadium, chromium, manganese, molybdenum, tungsten or rhenium. Preferred Properties: The particle size is 0.1-100 nm. The concentration of particles in the aqueous solution is 0.01-500 g/L. The ratio by weight of the nanoparticles to stabilizer is 10:1-1:10.    TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The polysaccharide consists of gum arabic, xanthan gum and/or tragacanth.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Materials: Hydrogen, hydrazine, formic acid, formaldehyde, lower aliphatic alcohols or similar compounds which decompose to give gaseous constituents during the reduction reaction are used as reducing agents.    TECHNOLOGY FOCUS - METALLURGY - Preferred Process: After application of the noble metal nanoparticles, the polysaccaharide is removed by pyrolysis at up to 250 degreesC. EXAMPLE - 11.1g of a solution of bis(ethanolammonium) hexahydroxoplatinate (Pt content 9 wt.%; total chlorine content of less than 100 ppm) was added dropwise to 1.5 L of fully deionized water in which 1g of gum arabic had been previously dissolved. Ethanol (1 L) was added with stirring and the resulting mixture was heated, where the mixture turned black. The solution was kept under reflux for 1 hour at 85 degreesC and concentrated to 100 ml by evaporation. The colloidal solution has a pH of 5.9 and contained 10 g Pt/L (1 wt.% Pt) and 10 g/L (1 wt.%) of the stabilizer gum arabic. The ratio of Pt nanoparticles to stabilizer was 1:1. The total chlorine content of the solution was less than 10 ppm. The average size of the Pt particles as determined by transmission electron microscopy (TEM) was 2 nm.