|
Appearance
|
Yellowish-orange colored powder
|
|
Identity (IR)
|
Conforms to structure
|
|
Solubility (0.1 % in water)
|
Clear (passes ACS test)
|
|
Visual transition range
|
from pH 3.2 (pink or red) to pH 4.4 (yellow-orange)
|
|
Absorption maxima in 0.01 N NaOH
|
461 to 469 nm
|