IOD IRON ORCHID DESIGN DECOR MOULDS ( OLIVE CREST )IOD Moulds can be used with many different mediums. We will cover the two most common here. Every medium has its own characteristics, challenges, and virtues. Air dry clay, or paper clay: IOD paper clay is an air dry medium, and one of our favorites. Like most paper pulp based air dry clays, some shrinking, warping, and cracking is inherent. We like these qualities for a distressed, authentically vintage look. Our favorite way to apply moulded pieces