This colorless white salt is both odorless and non-volatile when synthesized and stored under standard conditions. It is the ammonium salt of oxalic acid, which is a naturally occurring substance found in numerous plants and vegetables. There are numerous vertebrate animals that also produce ammonium oxalate via metabolism of glyoxylic acid and ascorbic acid before being excreted in the urine. Ammonium oxalate can also be found as a constituent of kidney stones in humans, and is also present in the waste excretions of many species of bat. Its primary use in chemistry laboratory settings is as a an analytical or as a general reducing agent. It is also frequently combined with other oxalates in the synthesis of anticoagulants that are added to blood samples in order to preserve them when outside a living body. Ammonium oxalate is a stable compound, and can typically be stored under the typical conditions of 77 degrees Fahrenheit at a standard air pressure of 100 kPa.