Acidic Essence

The Acidic Essence is a treasure in Pikmin: The Winds of Light. It is found near the Blue Onion in the Spring of Serenity. It is actually a small green marble. To reach it, break down the gate to the Blue Onion, but watch out for the nearby Reaching Crawmad.

Olimar's journal

 * "The material encased in this sphere seems to be slightly acidic, which would explain why it was contained in a sphere. The Blue Pikmin seemed rather attracted to it, so they were reluctant to move it."