In most operating theatres. unused sterile instruments must be re-sterilized according to preset protocols. Protocols differ among institutions and are not based on strong scientific evidence. Objective: To determine and compare the duration of sterility of small instruments packaged in double-layered linen versus plastic-paper envelopes after autoclaving. https://www.roneverhart.com/Madelaine-Silver-Foiled-Milk-Chocolate-Hearts-5LB-Bag/