1-Naphtholphthalein is noted for its consistent composition and reliable behavior, as evidenced by its molecular formula C28H18O4 and molecular weight of 418.4. This compound belongs to the class of organic compounds known as phthalocyanines, characterized by their planar structure and extensive conjugated system. As a Warning level substance, it is important to handle this compound with care due to potential skin irritation. It finds utility in various applications, particularly as a pH indicator, owing to its ability to change color in response to changes in acidity.

• CAS Number: 596-01-0
• Exact Mass: 418.12050905
• Molecular Weight: 418.4
• GHS Signal Word: Warning
• Molecular Formula: C28H18O4
• Hazard Statements:
• H315: Causes skin irritation [Warning Skin corrosion/irritation]