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Handling Practices
Purchase picric acid in small quantities with phenolic resin caps only. Do not break the seal on the container until the material is needed. Store picric acid away from incompatible materials including metallic compounds.
When picric acid is purchased weigh the container and note the weight on the bottle. After the reagent is opened and an aliquot is taken note the weight of the container. Prior to subsequent use weigh the container. If the weight is less than the previous weight, add water to the container as needed.
After each use, wipe down the bottle neck cap, and threads with a wet cloth before resealing. Do not allow picric acid to contact metal that is readily oxidized, or transfer the material to a container with a metal cap. Picric acid will form explosive metal picrates. Lead, iron and copper should be considered particularly dangerous. Metal picrates are extremely shock sensitive and will detonate with the slightest movement or vibration.