NILE 
CHEMICALS
ERIOCHROME BLACK T.
| 
         SPECIFICATION  | 
    |
| C20H12N3NaO7S M.W. 461.38 | |
| C.I.No. 14645 | |
| Suitable as metal indicator | passes test | 
| Absorption maximum ( pH 10 ) | 612 - 616 nm | 
| ( Indicator for the determination | |
| of calcium plus magnesium by | |
| titration with EDTA ) | |
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