Corrosive [Property]

The surface of this weapon looks dark and pitted, and the blade, point, or head appears fragile, as if the first blow might break it.

When activated, a corrosive weapon is sheathed in acid. The acid does not harm you as long as you have the weapon in hand. The effect persists until you speak a second command word. A weapon that has this property deals an extra 1d6 points of acid damage on a successful hit.

Projectile weapons bestow this property upon their ammunition.

Prerequisites: Craft Magic Arms and Armor, acid arrow, acid fog, acid storm, or storm of vengeance.

Cost to Create: Varies.

Source: Magic Item Compendium, page 31.

Acidic Burst [Property, Synergy]

The surface of this weapon is pitted and worn.

An acidic burst weapon functions as a corrosive weapon.

In addition, the weapon automatically showers an opponent with acid upon a successful critical hit, dealing extra acid damage as set out on the table below. This acid does not harm you or any creature other than the target. This is a continuous effect and requires no activation. Even if the weapon has not been activated to deal the extra 1d6 points of acid damage that comes from the corrosive property, the weapon still deals its extra acid damage on a successful critical hit.

Projectile weapons bestow this property upon their ammunition.

Prerequisites: Craft Magic Arms and Armor, acid arrow.

Cost to Create: Varies.

Source: Magic Item Compendium, page 28. Both the acidic burst and corrosive properties were first published in Stormwrack, page 129. Acidic burst was published there as a standalone property rather than a synergy property to the corrosive property it became in the Magic Item Compendium.