Picramic acid

Picramic acid, also known as 2-amino-4,6-dinitrophenol,^[3] is an acid obtained by neutralizing an alcoholic solution of picric acid with ammonium hydroxide. Hydrogen sulfide is then added to the resulting solution, which turns red, yielding sulfur and red crystals. These are the ammonium salts of picramic acid, from which it can be extracted using acetic acid.^[4] Picramic acid is explosive and very toxic. It has a bitter taste.^[5]

Quick facts Names, Identifiers ...

Picramic acid

Names
Preferred IUPAC name 2-Amino-4,6-dinitrophenol
Identifiers
CAS Number	96-91-3 Y
3D model (JSmol)	Interactive image
ChEMBL	ChEMBL3183248
ChemSpider	4103087 Y
ECHA InfoCard	100.002.314
EC Number	202-544-6
PubChem CID	4921319
UNII	5VDQ7GK8L3 Y
UN number	3317
CompTox Dashboard (EPA)	DTXSID5024479
InChI InChI=1S/C6H5N3O5/c7-4-1-3(8(11)12)2-5(6(4)10)9(13)14/h1-2,10H,7H2 Y Key: QXYMVUZOGFVPGH-UHFFFAOYSA-N Y InChI=1S/C6H5N3O5/c7-4-1-3(8(11)12)2-5(6(4)10)9(13)14/h1-2,10H,7H2
SMILES c1c(cc(c(c1N)O)[N+](=O)[O-])[N+](=O)[O-]
Properties
Chemical formula	C6H5N3O5
Molar mass	199.122 g·mol−1
Appearance	Brown paste
Density	1.749 g/cm3
Melting point	169 °C (336 °F; 442 K)
Boiling point	386.3 °C (727.3 °F; 659.5 K)
log P	2.4184[1]
Refractive index (nD)	1.73[1]
Hazards
GHS labelling:[2]
Pictograms
Signal word	Danger
Hazard statements	H201, H302, H312, H332, H412
Precautionary statements	P210, P230, P240, P250, P261, P264, P270, P271, P273, P280, P301+P312, P302+P352, P304+P312, P304+P340, P312, P322, P330, P363, P370+P380, P372, P373, P401, P501
Flash point	187.5 °C (369.5 °F; 460.6 K)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Y verify (what is YN ?) Infobox references

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Along with its sodium salt (sodium picramate) it is used in low concentrations in certain hair dyes, such as henna, it is considered safe for this use provided its concentration remains low.^[6]