There is no "full effect" to be felt from item spells. The only "full effect" would be the ashes that have active bonuses (hp recharge, energy recharge, etc). Other ashes usually work in two ways, being activated when dropped (which can be manually dropped or after the spell duration) or a passive effect while held (+AL, +energy, +hp, faster casting, faster recharge, etc). All in all, they all work exactly how the spell description describes...
that make sense?