The item under consideration is Chromotrope ® 2R (C.I. 16570), a chromogenic dye within the Life Science category, specifically designed for histology and microscopy applications. Its scientific name is disodium;5-amino-4-hydroxy-3-phenyldiazenylnaphthalene-2,7-disulfonate, with a molecular formula of C16H11N3Na2O7S2 and a molecular weight of 467.4 g/mol. This compound carries a Warning signal word due to its potential for causing serious eye irritation. The exact mass of this dye is approximately 466.98338061 u. It falls under the category code CID 19116 and is also known as Azo fuchsine according to IUPAC nomenclature.

• CAS Number: 4197-07-3
• Molecular Formula: C16H11N3Na2O7S2
• Molecular Weight: 467.4
• Exact Mass: 466.98338061
• GHS Signal Word: Warning
• Hazard Statements:
• H319 (47.1%): Causes serious eye irritation [Warning Serious eye damage/eye irritation]