
Fluorescein 200% ( resorcinolphthalein ) UV DYE Pure Compound - 100g
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Description
Fluorescein 200% (Resorcinolphthalein)
Other Names: Fluorescein sodium (when in salt form), 3',6'-Dihydroxyspiro[isobenzofuran-1(3H),9'-[9H]xanthen]-3-one
Chemical Formula: C₂₀H₁₂O₅
Molar Mass: 332.31 g/mol
CAS Number: 2321-07-5 (free acid form)
Appearance: Orange-red to dark red powder
Purity: Pure compound (technical grade, UV dye content ~200%)
Fluorescein is a synthetic organic compound from the xanthene dye group. It exhibits strong fluorescence and is used extensively as a tracer dye and UV-reactive marker in industrial and analytical contexts. In its pure acid form, it appears dark red under visible light and glows bright green under UV illumination (excitation ~490 nm, emission ~515 nm).
Chemical and Physical Properties
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Density: ~1.6 g/cm³
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Melting Point: ~314 °C (with decomposition)
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Solubility in Water: Low (as free acid); forms water-soluble salts
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Solubility in Solvents: Soluble in alcohol, alkali solutions, and polar organic solvents
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Fluorescence: Intense green fluorescence under UV or blue light
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Stability: Stable under normal conditions, light-sensitive
Applications
UV and Fluorescent Tracing
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Used as a fluorescent tracer in leak detection, flow studies, and hydraulic modeling in pipelines and open water systems.
Industrial Dyeing
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Applied in quality control, UV detection systems, and marker dyes for inks and coatings.
Analytical Chemistry
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Employed as a pH-sensitive indicator and in fluorometric titrations.
Research and Laboratory Use
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Utilized in imaging techniques and to label or visualize fluid movements under UV light.
Safety
Signal Word: Warning
Hazard Statements:
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H315: Causes skin irritation
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H319: Causes serious eye irritation
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H335: May cause respiratory irritation
Precautionary Statements:
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P261: Avoid breathing dust
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P264: Wash hands thoroughly after handling
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P271: Use only outdoors or in a well-ventilated area
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P280: Wear protective gloves, protective clothing, and eye protection
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P305+P351+P338: IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses if present and easy to do. Continue rinsing
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P337+P313: If eye irritation persists: Get medical advice/attention
Handling and Storage
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Handling: Avoid generation of dust. Use in well-ventilated or filtered-air environments. Wear suitable protective clothing and avoid contact with skin and eyes.
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Storage: Store in a cool, dry, and dark container, tightly sealed. Protect from direct sunlight and moisture.
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Incompatibilities: Strong oxidizing agents, acids
Environmental Considerations
Although fluorescein is used in environmental tracing, concentrated discharge into aquatic environments should be minimized. Follow local regulations regarding disposal of dye-containing solutions.