Table 2.
Chemical structures and maximum wave lengths (λmax) of some azo dyes.
| Dyes | Chemical structures | λmax (nm) | Groupings |
|---|---|---|---|
| Yellow reactive 4 (YR4) |  |
385 | monoazo |
| Black reactive 5 (BR5) |  |
590 | disazo |
| Direct blue 71 (DB71) |  |
575 | triazo |
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