Tartrazine E102 Food Yellow 4 insoluble lake pigment


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Please note: pigments are insoluble in water. They are for use in dry applications (such as mixture with other powder to colour it), or for mixture with oil to form a suspension e.g, with linseed oil to make oil paints. If you need a colouring to dissolve in water, please see our range of water soluble dyes.

Lakes are often used to colour food, drugs and cosmetics. For food colouring, lake pigments are used when water soluble food dyes are inefficient. Specifically, when the food at hand lacks the appropriate level of moisture in which other types of dyes can dissolve, lake pigments are often used. Lake pigments are also used for colouring foods containing fats and oils. While both traditional food dyes and lake pigments are both oil insoluble, lakes are oil dispersible. Lakes are commonly used in personal care products such as lipsticks, eye-shadow, nail polishes, lotions and other cosmetics because of their chemical attributes and colouring qualities.

IUPAC name

Trisodium 5-hydroxy-1-(4-sulfonatophenyl)-4-[(E)-(4-sulfonatophenyl)diazenyl]-1H-pyrazole-3-carboxylate

Other names

FD&C Yellow 5

CAS Number ·         1934-21-0 
3D model (JSmol) ·         Interactive image
ChemSpider ·         10606981 
ECHA InfoCard 100.016.091
E number E102 (colours)
PubChem CID ·         6321403
UNII ·         I753WB2F1M 
Chemical formula C16H9N4Na3O9S2
Molar mass 534.36 g·mol−1
Solubility in water 20 g/100 mL
Solubility 18 g/100 mL in glycerol, negligible in ethanol
NFPA 704 1



Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references


Additional information


25 grams, 50 grams


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