<Tr> <Td> Appearance </Td> <Td> white powder </Td> </Tr> <Tr> <Td> Density </Td> <Td> 1.482 g / cm </Td> </Tr> <Tr> <Td> Boiling point </Td> <Td> 338.4 ° C (641.1 ° F; 611.5 K) </Td> </Tr> <Tr> <Td_colspan="2"> Except where otherwise noted, data are given for materials in their standard state (at 25 ° C (77 ° F), 100 kPa). </Td> </Tr>

According to the equation for the ninhydrin reaction