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11 Potentially Explosive Chemicals E. Picric Acid & other di- and tri-nitro compounds Di- and tri-nitro compounds are potentially explosive in certain situations. Picric Acid is probably the most common example of a tri- nitro compound used in laboratories. Picric acid is sold wet. As water evaporates the substance becomes shock sensitive. Dry picric acid is highly explosive, especially if combined with metals such as copper, lead, zinc, and iron. It will also react with alkaline materials including plaster and concrete to form explosive materials. • Only purchase wetted or stabilized tri & di nitro compounds • Date containers • Hydrate chemicals as needed with dionized water • Store in an approved flammable safety cabinet • Dispose of bottles that have exceeded the expiration date