Which packaging is used for volatile chemicals and residues?

• A. Sealed metal can only
• B. Plastic bag with no seal
• C. Paper envelope
• D. They must be packaged in unlined paint cans, glass jars, or arson bags. Double seal to prevent vapors from escaping.

Answer: (D)

Volatile substances must be kept in containers that are nonporous, chemically inert, and tightly sealable to stop evaporation and protect handlers. Unlined metal paint cans and glass jars provide strong, nonreactive interiors and can be sealed shut, which minimizes vapor loss. Arson bags are specialized containers designed to hold volatile residues and withstand vapor pressure, and adding a double seal creates a second barrier so vapors are unlikely to escape even if one seal is compromised. This combination preserves the evidence’s integrity and reduces exposure risk during handling and transport. In contrast, a plastic bag with no seal or a paper envelope would permit vapors to escape or permeate, making them unsuitable for volatile chemicals and residues.