-  The reactivation instruction is for paper, cloth/fabric, special, and PET (clear plastic) packets.  -  You can use either oven or microwave for reactivation. 1. Oven: Bake packets or beads for 0.5 - 2 hours at 200 - 250F. 2. Microwave: DEFROST packets or beads for  7-12 minutes. * Start with the least amount of time and increase the time if color is not fully returned to the original state.. * Reactivation time varies depending on the saturation level of beads, and types of microwave. * Many microwaves do not let you choose time for Defrost mode. Instead, they want you to enter the weight and the microwaves automatically calculate the time for you based on the weight.  You can enter several weights and choose the weight that gives you the closest time to 7 minutes. * PET (clear plastic) packets may melt in high power oven or microwave * Spread beads evenly in thin layer for best result. * Aiwa packets have its own method of reactivation.