Features of Colloidal gold solution : Nano Colloidal gold solution is prepared by dispersing 15nm or even smaller gold nanoparticles into water solution. The preparation will end up with uniform neutral solution with stable color. The gold nanoparticles solution appears to be faint red not golden brown. The gold nanoparticles solution appears to be azury when in condensed state by adding other substance. The solution is edible for human beings and totally safe for skin contact. Like silver nanoparticles, Au nanoparticles are resistant to antibiotics. Application of Colloidal gold solution : When added to the cosmetic product,Au nanoparticles play a role of whitening, anti-aging and emollients; or as Food colorants organisms; Genetic identification; Environmental purification prod

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