Azoic dyes Coupler Disperse dyes Vat Dyes Reactive dyes basic dyes Sulfur Dyes Leather dyes Acid dye Cationic dyes Direct Dyes Neutral dyes Solvent Dyes
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dye

Azoic dyes Coupler Disperse dyes Vat Dyes Reactive dyes basic dyes Sulfur Dyes Leather dyes Acid dye Cationic dyes Direct Dyes Neutral dyes Solvent Dyes
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Dyes refer to the organic substances enable the strong coloring of fiber and some other materials. There are various kinds of dyes. According to the source, they can be divided into natural dyes (such as vegetable dyes, animal dyes and mineral dyes, etc.) and synthetic dyes (or artificial dyes). According to the molecular structure, it can be divided into azo dyes, anthraquinone dyes, phthalocyanine dyes, aromatic dyes and nitro dyes. Based on the application methods, it can be divided into acid dyes, basic dyes, sulfur dyes, reactive dyes, disperse dyes, direct dyes and so on. Dyes have color, but substance having color does not necessarily belong to dyes. Dye must have a chromophore and auxochrome group. Dye contained in the ink should also have water-soluble group such as sulfonic acid group.

Natural dyes are dyes obtained from animals, plants and minerals. According to sources they can be divided into:
1    Plant dyes; dyes extracted from the roots, stems, leaves and fruit of some plants such as indigo extracted from the leaves of indigo (blue); curcumin extracted from turmeric (yellow); alizarin extracted from madder (red) and so on;
2    Animal dyes; dyes extracted from animal body such as carmine extracted from cochineal, etc;
3    Mineral dyes; dyes extracted from the colored inorganic substance of mineral such as chrome yellow, ultramarine blue, brown and other manganese. Owing to its various disadvantages compared with artificial dyes such as incomplete chromatography, application inconvenience and poor fastness, most natural dyes have been eliminated except for a few still in use.

Synthetic dyes, also known as "artificial dyes." is mainly made through the chemical processing of coal tar (or oil processing) fractionation products (such as benzene, naphthalene, anthracene and carbazole, etc.), sometimes are also known as coal tar dyes. Since the earliest several synthetic dyes all took aniline as raw material, it is also known as "aniline dyes." Compared with the natural dyes, synthetic dyes have various kinds with complete chromatography and most of them being colorful, washable and being able to be produced in large scale. Thus, almost all of the current so-called dye refers to synthetic dyes with its dyeing products being one of the common samples of Forensic evidence.

There are two ways for classifications of dyes:
The first type is the basic chemical taxonomy based on the chromophore. According to this, dyes can be classified into azo dyes, sulfur dyes, anthraquinone dyes, indigo dyes, heterocyclic dyes and phthalocyanine dyes, 10 categories in total.

The second type is based on the property of the dye to the fiber or coloring properties. Based on this, the dyes can be divided into acid dyes, neutral dyes, azoic dyes, basic dyes, cationic dyes, direct dyes, reactive dyes, sulfur dyes, vat dyes and other dyes, 14 categories in total.

There are various kinds of dyes of different properties and wide range of applications. However, dyes used as physical evidence are largely fixed in textile fibers or paper, or as a kind of organizational component of ink, printing ink and pen oil. Usually after extraction, it can subject to comparison testing using micro-chemical method, thin layer chromatography, liquid chromatography, UV - visible absorption spectroscopy and fluorescence spectroscopy.

The international development of dye was very rapid in 1970s while people have mainly focused on develop new varieties and improve quality since 1990s with the annual output being maintained at the level of 100 million tons.

Chinese dyes got rapid development in 1980s with the main focus being improving the quality after 1990 as well. The production output still maintain a certain growth rate with annual output being around 300,000 t. In 2000, the output is 315 600 t. Dyes used for textile dyeing account about 85% with the rest being used for the coloring of leather, plastic, paper and paint.

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Chemical Name:
C.I.Acid Brown 121
Chemical Name:
Disperse Black BSF
Chemical Name:
Disperse Yellow 2G
Chemical Name:
Direct Red 3B
Chemical Name:
Disperse Grass Green GL
Structure:
Chemical Name:
Magentagreencrystals
CAS:
14426-28-9
MF:
C23H25N2+
Chemical Name:
ACID BROWN85 (C.I. 34900)
CAS:
77031-30-2
Structure:
Chemical Name:
Disperse Red 177
CAS:
58051-98-2
MF:
C20H19N6O4S
Structure:
Chemical Name:
ACID BLACK 2
CAS:
80316-29-6
MF:
C48H35N9
Chemical Name:
Vat Brown 68
CAS:
12237-38-6
Structure:
Chemical Name:
Disperse Blue 301
CAS:
105635-65-2
MF:
C21H25BrN6O8
Structure:
Chemical Name:
Vat Orange 1
CAS:
1324-11-4
MF:
C24H10Br2O2
Chemical Name:
Reactive Red Brown K-B3r
CAS:
12225-66-0
MF:
C29H20IN7Na2O12S3
Structure:
Chemical Name:
Vat Red 31
CAS:
12227-47-3
MF:
C30H16N4O5
Structure:
Chemical Name:
Acid Black 58
CAS:
12218-94-9
MF:
C40H35CrN6O12S2
Structure:
Chemical Name:
DISPERSE BLUE 106
CAS:
12223-01-7
MF:
C14H17N5O3S
Structure:
Chemical Name:
ACID VIOLET 5
CAS:
10130-48-0
MF:
C25H23N4NaO10S3
Structure:
Chemical Name:
Solvent Yellow 114
CAS:
7576-65-0
MF:
C18H11NO3
Chemical Name:
C.I.Acid Blue 25
Chemical Name:
Neutral sizing agent
Chemical Name:
C.I.Mordant Green 17
Chemical Name:
Transparent Yellow GS
Chemical Name:
Sulphur Olive Green
Chemical Name:
Cationic Red 6B
Chemical Name:
Leather Spray Black 1
Chemical Name:
Leather Spray Green B
Chemical Name:
Rhamsan gum
CAS:
96949-21-2
Chemical Name:
NEUTRAL RED S-G
Structure:
Chemical Name:
Vat Orange 2
CAS:
1324-35-2
MF:
C30H12Br2O2
Chemical Name:
Cellulase
Chemical Name:
Mitsui
Structure:
Chemical Name:
BASIC BLUE 3
CAS:
33203-82-6
MF:
C20H26ClN3O
Structure:
Chemical Name:
2,4-Dihydro-4-[(2-hydroxy-5-nitrophenyl)azo]-5-methyl-2-phenyl-3H-pyrazol-3-one chromium complex
CAS:
52256-37-8
MF:
C32H23CrN10O8
Structure:
Chemical Name:
Disperse Red 73
CAS:
16889-10-4
MF:
C18H16N6O2
Structure:
Chemical Name:
MORDANT BROWN 4
CAS:
6247-27-4
MF:
C13H12N6O5
Structure:
Chemical Name:
Solvent Yellow 98
CAS:
12671-74-8
MF:
C36H45NO2S
Structure:
Chemical Name:
Solvent Red 149
CAS:
21295-57-8
MF:
C23H22N2O2
Structure:
Chemical Name:
1,8-Bis(phenylthio)-9,10-anthracenedione
CAS:
13676-91-0
MF:
C26H16O2S2
Structure:
Chemical Name:
Vat Yellow 2
CAS:
129-09-9
MF:
C28H14N2O2S2
Structure:
Chemical Name:
Disperse Yellow 64
CAS:
10319-14-9
MF:
C18H10BrNO3
Structure:
Chemical Name:
FAST ORANGE GR SALT
CAS:
25910-37-6
MF:
C6H4N3O2+
Structure:
Chemical Name:
N-(4-Ethoxyphenyl)-3-hydroxy-2-naphthamide
CAS:
4711-68-6
MF:
C19H17NO3
Structure:
Chemical Name:
BASIC RED 29
CAS:
42373-04-6
MF:
C19H17ClN4S
Structure:
Chemical Name:
Disperse Blue 165
CAS:
41642-51-7
MF:
C20H19N7O3
Chemical Name:
Dispersing agent
Structure:
Chemical Name:
Disperse Red 74
CAS:
61703-11-5
MF:
C22H25N5O7
Structure:
Chemical Name:
Vat Voilet 3
CAS:
2379-75-1
MF:
C20H14Cl2O2S2
Structure:
Chemical Name:
Solvent Blue 104
CAS:
116-75-6
MF:
C32H30N2O2
Chemical Name:
Acid Blue 225
CAS:
12216-97-6
Structure:
Chemical Name:
Solvent Green 20
CAS:
12226-82-3
MF:
C28H22N2O4
Chemical Name:
Reactive Red 15
CAS:
12238-01-6
MF:
C25H14ClN7O13S4.4Na
Structure:
Chemical Name:
Fast Scarlet RC Base
CAS:
27165-17-9
MF:
C7H6N3O3+
Structure:
Chemical Name:
Direct Yellow 86
CAS:
50925-42-3
MF:
C39H30N10Na4O13S4
Structure:
Chemical Name:
trisodium 2-[[6-[(4-amino-6-chloro-1,3,5-triazin-2-yl)methylamino]-1-hydroxy-3-sulphonato-2-naphthyl]azo]naphthalene-1,5-disulphonate
CAS:
70616-89-6
MF:
C24H19ClN7NaO10S3
Chemical Name:
Sulphur Dark Green
Chemical Name:
Disperse Violet DP
Chemical Name:
Acid brilliant red
Chemical Name:
Solvent Yellow GK
Chemical Name:
C.I.Acid Blue 45
Chemical Name:
Sulphur Blue BN
Chemical Name:
C.I.Acid Green 3
Chemical Name:
C.I.Acid Red 444
Chemical Name:
C.I. Acid Orange 142
CAS:
61901-39-1
Chemical Name:
C.I. Direct Blue 85
CAS:
61724-72-9
Structure:
Chemical Name:
Disperse Violet 26
CAS:
6408-72-6
MF:
C26H18N2O4
Structure:
Chemical Name:
2-Hydroxy-N-(4-methoxyphenyl)-11H-benzo[a]carbazole-3-carboxamide
CAS:
86-19-1
MF:
C24H18N2O3
Structure:
Chemical Name:
Solvent Violet 8
CAS:
52080-58-7
MF:
Unspecified
Structure:
Chemical Name:
Disperse Yellow 114
CAS:
61968-66-9
MF:
C20H16N4O4S
Chemical Name:
Disperse Red 127
CAS:
66795-75-3
MF:
C25H21NO6
Chemical Name:
Vat Green 13
CAS:
57456-28-7
MF:
C46H21IN2O5
Structure:
Chemical Name:
Disperse Red 98
CAS:
12223-49-3
MF:
C17H20N4O3
Structure:
Chemical Name:
Direct Yellow 28
CAS:
8005-72-9
MF:
C28H18N4O6S4.2Na
Chemical Name:
Acid Green 40
CAS:
12219-87-3
Structure:
Chemical Name:
Direct Green 59
CAS:
7219-11-6
MF:
C47H31N12O17S3.5Na
Chemical Name:
SOLVENT ORANGE 24
Chemical Name:
Sulfur Yellow GC
Chemical Name:
Disperse Violet RN
Chemical Name:
Basic Brown RC
Chemical Name:
Acid Blue 7BF
Chemical Name:
Double Sulphur Black
Chemical Name:
Vat Brown 5R
MF:
C26H10Cl2N4O2
Chemical Name:
C.I.Solvent Orange 62
Chemical Name:
Solvent Orange 5A
Chemical Name:
Leather Yellow GL
Chemical Name:
Direct Blue 219
Chemical Name:
Leather Spray Black B
Structure:
Chemical Name:
Disperse Red 73
CAS:
12270-46-1
MF:
C18H16N6O2
Chemical Name:
Vat black 22
CAS:
61868-00-6
Structure:
Chemical Name:
CALCOMINE DARK GREEN BG
MF:
C34H23N7Na2O8S2
Chemical Name:
Neutral dissociator
Structure:
Chemical Name:
Naphthol AS-LC
CAS:
4273-92-1
MF:
C19H16ClNO4
Structure:
Chemical Name:
DISPERSE RED 13
CAS:
3180-81-2
MF:
C16H17ClN4O3
Chemical Name:
ACID BLACK 235
Structure:
Chemical Name:
DIRECT YELLOW 50
CAS:
3214-47-9
MF:
C35H24N6Na4O13S4
Structure:
Chemical Name:
Disperse Brown 1
CAS:
23355-64-8
MF:
C16H15Cl3N4O4
Structure:
Chemical Name:
Solvent Red 196
CAS:
52372-36-8
MF:
C23H18N4O2
Structure:
Chemical Name:
Solvent Yellow 93
CAS:
4702-90-3
MF:
C21H18N4O2
Structure:
Chemical Name:
Disperse Red 86
CAS:
81-68-5
MF:
C22H18N2O5S
Structure:
Chemical Name:
Solvent Blue 122
CAS:
67905-17-3
MF:
C22H16N2O4
Structure:
Chemical Name:
Disperse Blue 291
CAS:
56548-64-2
MF:
C19H21BrN6O6