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Jyoti Chaudhary*, Giriraj Tailor* and Ajit Joshi


Nanotechnology is a fundamental, enabling technology, allowing us to do new things in almost every conceivable technological discipline. Another such reagent involves highly charged gold nanoparticles. These attach to the residue forming a weak gold image which can be amplified with a silver physical developer. Nanoparticles are also used in items such as paints, printing inks and writing inks. Paints and most printing inks consist of Nano-sized pigments in a vehicle. However, certain modern ink jet printing inks now contain Nano-sized pigments to improve their light fastness and most gel inks are also based on Nano scale pigments. These nanoparticle containing materials often appear as evidence and are thus subject to forensic characterization. Both luminescent (quantum dots), up-converting Nano scale phosphors and non-luminescent nanoparticles are used as security tags to label product, add security to documents and as anti-counterfeiting measures. These assist in determining if an item is fraudulently made.

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