784

The nanomachine colony shows two weaknesses: first, individual nanomachines cannot function without a physical connection to the biological portion. Secondly, exposure to heat (above 100 degrees C) or certain solvents will cause the nanomachines to denature in a manner similar to proteins: a 100% acetone solution has shown to be both effective and easy to obtain in large quantities, and has been selected as the containment medium.

http://www.scp-wiki.net/scp-784-arc

The heavy concrete container rested at the bottom of a deep pool of acetone, the sharp odor of the solvent cutting through her paper-and-cloth respirator mask. The acetone was a safety measure: the nanomachines that made up the artifact's mechanical portions were very similar to proteins, and would disintegrate under heat and heavy solvents.

http://www.scp-wiki.net/784incident1