English 
Description
| Chemical Name | Bromothymol Blue |
| Chemical Grade | AR |
| Chemical Formula | C₂₇H₂₈Br₂O₅S |
| Chemical Weight | 624,38 g/mol |
| CAS No | 76-59-5 |
| Solubility in Water | Slightly soluble |
| Appearance | Brown coloured powder |
| Melting Point | Melting Point/Range: 200 – 202 °C – lit. |
| Dye content (%) | > 95 |
| Absorptivity (E1% in 1cm cell at λ1 max) pH 5.8 | 260 – 300 |
| Absorptivity (E1% in 1cm cell at λ2 max) pH 7.6 | 470 – 520 |
| Loss on Drying (110ºC) (%) | < 1.0 |
| Solubility at 0.1% (95% Ethanol) | Clear solution |
| Transition range | pH 5.8 – 7.6 (Yellow – Blue) |
| Wavelength of maximum absorption (pH 5.8) λ1 max | 430.5 nm |
| Wavelength of maximum absorption (pH 7.6) λ2 max | 616 nm |
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