TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Composition: The composition (c1) comprises either 0.2-4 wt.% particles (p1), 0.2-4 wt.% water, and 92-99.6 wt.% first and second organic solvent (preferably ethanol); or 0.2-10 wt.% particles (p1), 0.2-10 wt.% water, and 80-99.6 wt.% first and second organic solvent (preferably 2-propanol); or 0.2-20 wt.% particles (p1), 0.2-20 wt.% water, and 60-99.6 wt.% first and second organic solvent (preferably 1-propanol); or 0.2-16 wt.% particles (p1), 0.2-16 wt.% water, and 68-99.6 wt.% first and second organic solvent (preferably 1-butanol); or 0.2-20 wt.% particles (p1), 0.2-20 wt.% water, and 60-99.6 wt.% first and second organic solvent (preferably 2-butanol); or 0.2-10 wt.% particles (p1), 0.2-10 wt.% water, and 80-99.6 wt.% first and second organic solvent (preferably tert-butanol); or 0.2-13 wt.% particles (p1), 0.2-13 wt.% water, and 74-99.6 wt.% first and second organic solvent (preferably acetonitrile); or 0.2-4 wt.% particles (p1), 0.2-4 wt.% water, and 92-99.6 wt.% first and second organic solvent (preferably propionitrile); or 0.2-10 wt.% particles (p1), 0.2-10 wt.% water, and 0.6-80 wt.% 1-propanol as first organic solvent and 0.5-99 wt.% methanol as second organic solvent. The composition (c1) comprises nanoparticles in an amount of 0.1-20 wt.% and homogeneous solvent composition in an amount of 80-99.9 wt.%. Preferred Components: The homogeneous solvent composition additionally comprises a second organic solvent forming a binary azeotrope with water, where the amount of water in the solvent composition is below the total azeotropic water content with respect to the first and second organic solvent; and a third organic solvent not forming a binary azeotrope with water. The first organic solvent is selected from alcohols and nitriles; the second organic solvent is selected from alcohols, nitriles, ones, esters, ethers, aldehydes and alkoxy-alcohols; and the third organic solvent is selected from alcohols, nitriles, ketones, esters, ethers, aldehydes and alkoxy-alcohols, where the alcohols may be partly or fully substituted with halo, and alcohols may contain multiple bonds, and organic solvents may include linear, branched or cyclic derivatives. EXAMPLE - Tungsten oxide nanoparticles with a nominal composition of WO3 were synthesized by flame spray synthesis. About 42 g sodium metatungstate was dissolved in 750 g distilled water and 75 g acetic acid. After adding 225 g aniline the solution was manually shaken for 3 minutes and washed three times with water in order to remove sodium and acetic acid. The obtained solution was diluted with tetrahydrofuran 1:2 by weight. The precursor then was fed (5 ml/minute) to a spray nozzle, dispersed by oxygen (7 l/minute) and ignited by a premixed methane-oxygen flame (CH4: 1.2 l/minute, O2: 2.2 l/minute). The off-gas was filtered through a glass fiber filter by a vacuum pump at 20 m3/hour. The obtained tungsten oxide nanopowder (p3) was collected from the glass fiber filter. A tungsten oxide suspension was prepared as follows: 2 wt.% tungsten oxide nanopowder (p3) was dispersed by ball-milling for 60 minutes in a mixture of 2 wt.% distilled water and 96 wt.% dry ethanol. The finally prepared suspension was transparent and stable for more than 3 months. After 3 months, the hydrodynamic particle size (D99) was determined as 37 nm (measured by a centrifugal particle sizer). Tungsten oxide nanoparticle films were spin-coated on high-density polyethylene (HDPE) and polyvinyl chloride (PVC) foils under nitrogen resulting in homogeneous and defect-free tungsten oxide films. The thickness of the deposited tungsten oxide films was determined as 50 nm by scanning electron microscopy (SEM) . The surface roughness was estimated to be 5-10 nm (SEM). Annealing of the obtained films for 30 minutes at 130 degrees C in air resulted in a residual organic carbon content (microanalysis) of 0.5 wt.%.