It is normal for the Saucisson Sec to have the white mold on the casing. This is an edible mold (Penicillium) culture that imparts flavor, helps the drying process, prevents spoilage during curing and helps prevent photo-oxidation of the meat and rancidity in the fat. The mold is edible, but the casing can be removed (peeled) as well, depending on preferences. The Saucission needs to be kept refrigerated, wrapped in butcher paper ideally.