When liquids or solids are not labeled properly or the label becomes illegible, they can become unknown to the people responsible for it.

Procedures for Handling Unknown Chemical Waste

• Unknown or unlabeled chemical waste may require analysis prior to disposal.
• Attempt to identify the contents of unlabeled containers. NEVER GUESS the contents of a container.
• Consult with your Laboratory Manager concerning any unidentified waste.
• If the contents are unknown, then complete a Hazardous Waste Tag and indicate on the tag and label "chemical unknown."
• The container must be handled as hazardous waste.
• Notify the Facilities Department prior to pick-up.