There are a lot of uses of Picric Acid. It can be used in the preparation of various types of explosives. In metallurgy, it can be used to chisel alloys like AZ31. Red isopurpurate can be prepared from Picric Acid as well. It can also be used as a temporary marker for the skin. In the past, Picric Acid was used to treat burns and as an antiseptic and was sometimes used to measure glucose levels in the blood.