Few-layer graphene was prepared from the potassium-graphite intercalation compound (KC8) by hydroxylation. In an oxidative atmosphere, KC8 decomposes from its initial structural stage to a second or third stage. However, when KC8 was hydroxylated by dropping a small amount of water onto it in a nonoxidative atmosphere, the KC8 exfoliated with a disruption of the stage structure and agglomerated graphene was obtained. Sonication of this agglomerated graphene in water yielded few-layer graphene. It was found that dropping small quantities of water onto KC8 is effective for achieving graphene with just a few layers.