This work focuses on a systematic method to produce Ag. Cu. and Ag/Cu metallic nanoparticles (MNPs) in situ assisted with ultrasound on cellulose paper. By tuning the concentration of AgNO3 and CuSO4 salt precursors and ultrasound time. https://www.marcelovicente.com/product-category/color-depositing-mask-cocoa/