Block B10-16 
1-NAPHTHOL AR 
Acid range pH 0.2 - 1.8 Red to yellow
Alkaline range pH 7 - 8.8 Yellow to purple
Loss on drying (at 110 ?C) Max 5%
Appearance Green to Dark Red or Maroon Powder or Crystals
| CAS No. | 1733-12-6 |
|---|---|
| Molecular Formula | C21H18O5S |
| Molecular Weight | 382.44 |
| HS Code | 2934.9990 |
| Symbol | GHS07 |
| Signal Word | Warning |
| Hazardous Statement | H319-H315-H335 |
| Precaution Statement | P264-P271-P280-P302+P352-P304+P340-P305+P351+P338-P403+P233-P501 |
| Packing | 5 G |
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