Color Developing Agent 1

Color Developing Agent 1 (CD-1) is the first in the series of color developing agents used in developing color films. It is the organic compound N,N-diethyl-1,4-benzenediamine (DPD), which is usually in the form of the monohydrochloride salt.^[1] In color development, after reducing a silver atom in a silver halide crystal, the oxidized developing agent combines with a color coupler to form a color dye molecule.

Color Developing Agent 1

Names
Preferred IUPAC name N1,N1-Diethylbenzene-1,4-diamine
Other names N,N-diethyl-p-phenylenediamine DPD
Identifiers
CAS Number	93-05-0
3D model (JSmol)	Interactive image
ChEMBL	ChEMBL1452158
ChemSpider	13839884
ECHA InfoCard	100.002.014
EC Number	202-214-1
PubChem CID	7120
UNII	0QQA4DFV2J
UN number	1673
CompTox Dashboard (EPA)	DTXSID2025058
InChI InChI=1S/C10H16N2/c1-3-12(4-2)10-7-5-9(11)6-8-10/h5-8H,3-4,11H2,1-2H3 Key: QNGVNLMMEQUVQK-UHFFFAOYSA-N
SMILES CCN(CC)C1=CC=C(C=C1)N
Properties
Chemical formula	C10H16N2
Molar mass	164.252 g·mol−1
Hazards
GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H301, H314
Precautionary statements	P260, P264, P270, P280, P301+P310, P301+P330+P331, P303+P361+P353, P304+P340, P305+P351+P338, P310, P321, P330, P363, P405, P501
Related compounds
Related compounds	Color Developing Agent 2; Color Developing Agent 3; Color Developing Agent 4;
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Arthur Thomas Palin, a Fellow of the Royal Society of Chemistry, developed a widely used color based method of water testing using DPD to indicate the chlorine content of treated water.

See also

• Color Developing Agent 2
• Color Developing Agent 3
• Color Developing Agent 4