BROMO CRESOL PURPLE CAS NO.115-40-2

 PRODUCT NAME    :           BROMO CRESOL PURPLE

C.A.S, NO.                 :           115 - 40 - 2

M .Formula                :          C21H16Br2O5S

TEST                                                  LIMIT                                               RESULT

1. Appearance                           (light pink    to Buff powder)               (Passes test)        

2. Transition range                   pH 5.2 - 6.8                                        (Passes test)

                                                    Greenish yellow - Bluish violet

3. Solubility 0.1% (EtOH)         Clear golden yellow solution         (Passes test)

4. Absorptivity 1%, lcm,

  (pH 5.2) at A max, 431.8 nm                      (400 - 450)                        439

  (pH 6.8) at A max. 588.2 nm                     (1000 - 1100)                     1073

5. Dye content by Spectrophotometry      (> 95%)                              97.5 %

6. Loss on drying at 110°C (lhr)                 (< 1%)                               0.83 %

 C₂₁H₁₆Br₂O₅S