Appearance:Dark red powderSolubility:5% in Water / 2% in EthanolUV Ratios:435nmVisual Transition Range (pH7, aqueous):From pH 1.0 (yellow-orange) to pH 2.0 (red)From pH 6.0 (red) to pH 7.0 (yellow)From pH 11.0 (yellow) to pH 12.0 (blue)Storage:Store at RT