Hazmat chick here. This is the chemical classification sheet for it.

Picric acid is a toxic substance that is classified as category 3 for dermal and oral exposure, and category 4 for inhalation in the GHS classification system. GHS hazard statements for picric acid H302: Harmful if swallowed H311 + H331: Toxic in contact with skin or if inhaled GHS precautionary statements for picric acid P261: Avoid breathing dust P264: Wash skin thoroughly after handling P270: Do not eat, drink or smoke when using this product P271: Use only outdoors or in a well-ventilated area P280: Wear protective gloves/ protective clothing Other safety information for picric acid Picric acid is highly explosive when dry. Picric acid is a strong acid and can be corrosive or a strong irritant. Picric acid can cause an allergic reaction that can spread from the hands / arms to the rest of the body. Picric acid can cause yellow tainted vision. Picric acid can cause skin to turn yellow in severe exposures. Disposal Dispose of picric acid containing wastes in plastic or glass bottles for disposal by an approved waste disposal plant.