Table 11.
Chemical structures and λmax of some basic dyes.
| Dyes | Basic blue 9 (BB9) | Basic yellow 37 (BY37) | Blue nile (BN) |
|---|---|---|---|
| Chemical structures |  |
 |
 |
| λmax (nm) | 665 | 440 | 638 |
| Groupings | phthalocyanine | ketone imine | sulphonates |
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