Monoazo commercially available pigment

A number of commercially available yellow monoazo pigment lakes are based on a pyrazolone sulfonic acid derivative as a coupling component. An example is the aluminum tartrazine lake, listed in the Colour Index as Pigment Yellow 100,... 

Commercially Available Monoazo Yellow and Orange Pigments 217... 

Although standard types resist light well, especially in full shades, they are not as fast as most monoazo yellow pigments. Lightfastness is lost rapidly with decreasing depth of shade and decreasing pigment area concentration, respectively. The commercially available types disperse easily in most media. 

A selection of representative chemical structures from the vast range of reactive dyes now available commercially is illustrated in Figure 8.5. Reactive dyes may be prepared, in principle, from any of the chemical classes of colorant by attaching a fibre-reactive group to an appropriate molecule. In common with most application classes of textile dyes and pigments, most reactive dyes belong to the azo chemical class, especially in the yellow, orange and red shade areas. Examples are typified by the structurally related red monoazo reactive dyes, the dichlorotriazine 8.28a, Cl Reactive Red 1, the... 

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