1.2 ~ 2.8 (red to yellow); 7.4 ~ 9.0 (yellow to violet)
item: indicator
appearance: deep green crystalline powder
visual transition interval: 1.2 ~ 2.8 (red to yellow); 7.4 ~ 9.0 (yellow to violet)
solubility in ethanol: clear solution. (0.1% etoh).
drying loss, %(110.0c): ≤ 1.0