C.A.S. No.: 4197-24-4

Solubility 0.1% (50% EtOH): Clear solution

Absorption maximum (50% EtOH) ?max: 547-552nm

Absorptivity (A1%1cm in 50% EtOH at ?max): >2150

Loss On Drying (110°C): <10%

C.A.S. No.: 548-80-1

CI NO.: 16575

M.F.: C16H9N3Na2O10S2

M.W.: 513.37gm/mole

Dye Content (by Spectrophotometry): >75%

C.A.S. No.: 3952-78-1

M.F.: C19H15NO8

M.W.: 412.36gm/mole

Solubility in 0.1% (0.1N NaOH): Clear solution

Absorption Max (0.1N NaOH) ?max: 564-568nm

C.A.S. No.: 130-22-3

CI NO.: 58005

M.F.: C14H7NaO7S

M.W.: 342.26gm/mole

Dye Content (by Spectrophotometry): >70%

C.A.S. No.: 569-58-4

M.F.: C22H14O9 · 3NH3

M.W.: 473.44gm/mole

Solubility 0.1% (dist. Water): Clear Solution

Insoluble Matter: <0.1%

C.A.S. No.: 1064-48-8

CI NO.: 20470

M.F.: C22H14N6Na2O9S2

M.W.: 616.49gm/mole

Dye Content ( by Spectrophotometry): >80%

C.A.S. No.: 7385-67-3

M.F.: C20H18N2O2

M.W.: 318.38gm

Solubility 0.1% (MeOH): Clear solution

Absorption maximum (MeOH) ?max: 551-554nm

C.A.S. No.: 525-05-3

M.F.: C10H5O8NNa2S2 . xH2O

M.W.: 377.26gm/mole

Solubility 0.1% (Dist. Water): Clear solution

Absorption maximum (0.1N NaOH) ?max: 422-426nm