A process to obtain silver nanoplates concentrated within a solution that retains the shape after concentration, while increasing the optical density of the solution, the process comprises: adding a stabilizing agent to a preconcentrated solution, where the solution Preconcentrated comprises silver nanoplates, where each of the silver nanoplates has a plate shape, where the preconcentrated solution has a maximum optical density at a first wavelength； wherein the stabilizing agent comprises a polyvinyl based polymer and a borate； and increase the concentration of silver nanoplates in the preconcentrated solution, with the use of centrifugation, evaporation, filtration, dialysis or tangential flow filtration, to generate a concentrated solution, where the preconcentrated solution has a maximum optical density at a first wavelength, where the concentrated solution has a maximum optical density at a second wavelength, where the maximum optical density of the concentrated solution is greater than 10 cm -1 and where the maximum optical density of the concentrated solution is greater than the maximum optical density of the preconcentrated solution, and where at least 50% of the silver nanoplates in the preconcentrated solution retain the plate form in the concentrated solution.Un proceso para obtener nanoplacas de plata concentradas dentro de una solución que conserva la forma después de la concentración, a la vez que aumenta la densidad óptica de la solución, el proceso comprende: añadir un agente estabilizante a una solución preconcentrada, en donde la solución preconcentrada comprende nanoplacas de plata, en donde cada una de las nanoplacas de plata tiene una forma de placa, en donde la solución preconcentrada tiene una densidad óptica máxima a una primera longitud de onda； en donde el agente estabilizante comprende un polímero basado en polivinilo y un borato； y aumentar la concentración de las nanoplacas de plata en la solución preconcentrada, con el uso de centrifuga
