🔹 Key Features
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Oil-soluble – used where water resistance is needed
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Bright red to scarlet shades
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High transparency – ideal for transparent or tinted systems
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Good dispersion in nonpolar systems
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Used where dye-like solubility is preferred over pigment dispersion
🔹 Common Applications
| Industry | Usage |
|---|---|
| Grease & Lubricants | Coloring oil-based lubricants |
| Waxes & Polishes | Colored waxes for shoes, furniture, etc. |
| Plastics | Transparent coloration of polystyrene, PVC |
| Printing Inks | Specialty solvent-based inks |
| Cosmetics | Coloring oil-based formulations (non-FDA grades) |
| Histology & Microscopy | Lipid staining in biological samples (e.g., Oil Red O) |
🔹 Important Notes
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Not always lightfast: Oil-soluble dyes tend to have moderate resistance to light and heat, unlike true pigments.
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Staining nature: Can stain surfaces and skin—used cautiously.
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Sudan dyes (a type of oil red) are regulated or restricted in food/contact applications due to toxicity concerns.
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