DISPERSIONS OF LUMINESCENT RARE-EARTH OXIDE PARTICLES, VARNISH COMPRISING THESE PARTICLES, THEIR M

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Dispersion of particles of at least one oxide of at least one luminescent rare earth, disaggregated and stabilized in a hydrophobic liquid medium containing at least one surfactant, in which the said surfactant is a non-ionic surfactant having an HLB (hydrophilic-to-lipophilic balance) lower than 12. Method for preparing the dispersion. Varnish comprising the said disaggregated, stabilized and dispersed particles, and its method of preparation. Method for making substrates with the said varnish and substrate thereby marked. Method for identifying objects provided with a marking using the said varnish.