Glycin, or N-(4-hydroxyphenyl)glycine, is N-substituted p-aminophenol. It is a

photographic developing Photographic processing or photographic development is the chemical means by which photographic film or paper is treated after photographic exposure to produce a negative or positive image. Photographic processing transforms the latent image in ...

agent used in classic black-and-white

developer Developer may refer to: Computers *Software developer, a person or organization who develop programs/applications *Video game developer, a person or business involved in video game development, the process of designing and creating games *Web deve ...

solutions.Photographic Chemical Descriptions
/ref> It is unrelated to the

amino acid Amino acids are organic compounds that contain both amino and carboxylic acid functional groups. Although hundreds of amino acids exist in nature, by far the most important are the alpha-amino acids, which comprise proteins. Only 22 alpha ...

glycine Glycine (symbol Gly or G; ) is an amino acid that has a single hydrogen atom as its side chain. It is the simplest stable amino acid ( carbamic acid is unstable), with the chemical formula NH2‐ CH2‐ COOH. Glycine is one of the proteinog ...

. It is typically characterized as thin plates of white or silvery powder, although aged samples appear brown. It is sparingly soluble in water and most organic solvents; it is readily soluble in alkalies and acids.{{cite encyclopedia, last1=Mitchell, first1=Stephen C., last2=Waring, first2=Rosemary H., encyclopedia=Ullmann's Encyclopedia of Industrial Chemistry, publisher=Wiley-VCH, year=2000, doi=10.1002/14356007.a02_099, isbn=978-3527306732, chapter=Aminophenols Glycin is structurally related to

4-aminophenol 4-Aminophenol (or ''para''-aminophenol or ''p''-aminophenol) is an organic compound with the formula H2NC6H4OH. Typically available as a white powder, it is commonly used as a developer for black-and-white film, marketed under the name Rodinal. ...

and

Metol Metol (or Elon) is a trade name for the organic compound with the formula OC6H4NH2(CH3)SO4. It is the sulfate salt of ''N''-methylaminophenol. This colourless salt is a popular photographic developer used in black & white photography.Gerd L ...

. Decarboxylation of glycin gives Metol. Glycin has a milder reduction potential than Metol. The two developers have markedly different character. Glycin is slower-acting, but much longer-lasting in solution. Glycin is rarely used as a developing agent, primarily because it is expensive. In its dry form, it also has limited shelf life compared to Metol and

Phenidone Phenidone (1-phenyl-3-pyrazolidinone) is an organic compound that is primarily used as a photographic developer. It has five to ten times the developing power as Metol. It also has low toxicity and unlike some other developers, does not cause derm ...

. Glycin can be synthesized by treating ''p''-aminophenol with chloracetic acid in a solvent. Glycin is employed in some procedures of analytical chemistry.

References

Phenols Amino acids Photographic chemicals