User blog comment:Kogath/Monster Hunter 4 Ultimate for the Nintendo 3DS/@comment-4563270-20150216035946/@comment-969093-20150216094655

Relic equipment shows up in your equipment box regularly like all equipment does. It is highlighted with a special color (purple) in the slot's background. You must first make it ready for usage in Harth through the special blacksmith there before you can actually use it.