| Items | Standard |
| Max absorption wavelength， λ1 (PH4.5), nm, λ2 (PH6.2), nm |
523~528 427~437 |
| Mass absorption coefficient, λ1 (PH4.5), L/(cm·g), λ2 (PH6.2), L/(cm·g) |
≥130 ≥70 |
| Ethanol dissolution test | Pass |
| Residue on ignition (SO42-) | ≤0.2 |
| Ph | 4.5（Red）~6.2（Yellow） |
| Loss on drying | ≤1.0 |
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