| No. |
Characteristic |
Requirement |
| |
Total colour |
90% min. |
| 1) |
Chemical Name |
2', 4', 7-Tribromofluroscein |
| 2) |
Sum of volatile matter (at 135 C) and halides and sulfates
(calculated as sodium salts) |
< 10%, total |
| 3) |
Insoluble matter (alkaline solution) |
<0.5% |
| 4) |
Phthalic acid |
<1% |
| 5) |
a) 2-(3,5-Dibromo-2-4-dihydroxybenzoyl) benzoic acid
|
<0.5% |
| b) 2',4',5',7-Tetrabromofluorencein ethyl ester |
<1% |
| c) Brominated resorcinol |
<0.4% |
| d) Fluorescein |
<0.2% |
| e) Sum of mono - and dibromoflurescenis |
<2% |
| f) Tribromofluroresceins |
<11% |
| g) 2', 4', 5',7- terabromofluorescein |
<87% |
| 6) |
Lead (as Pb) |
<20 ppm |
| 7) |
Arsenic (as As) |
<3 ppm |
| 8) |
Mercury (as Hg) |
<1 ppm |
