Sigma-Aldrich Sudan I (C.I. 12055)

form

powder

Quality Level

200

composition

Dye content, ≥95%

color

orange to very dark orange

pH

10.2 (26 °C)

mp

131-133 °C (lit.)

solubility

chloroform: 1 mg/mL, clear to very slightly hazy, orange

density

0.32 g/cm³ at 20 °C ((68 °F) - OECD Test Guideline 109)

ε (extinction coefficient)

≥30000 at 223-233 nm in ethanol at 0.01 g/L

ε_max

≥6000 at 299-319 nm in ethanol at 0.01 g/L (2nd)