Pink opaque pigments are a category of colorants used in paints, coatings, plastics, cosmetics, and other materials to provide a solid, non-transparent pink color. Here's a detailed overview of the types, composition, uses, and properties:
🔍 Overview of Pink Opaque Pigments
Pink opaque pigments are created using various organic and inorganic compounds, designed to scatter light effectively, giving a solid, non-translucent appearance.
🎨 Common Types of Pink Opaque Pigments
1. Pigment Red 122 (Quinacridone Pink)
Chemical Class: Quinacridone
Color: Bright magenta-pink
Opacity: Moderate to high (often made more opaque with additives)
Properties:
High lightfastness (resistance to fading)
Excellent weather resistance
Common in artist paints and automotive finishes
2. Pigment Red 170 (Naphthol Red)
Chemical Class: Naphthol AS
Color: Slightly warmer pink-red
Opacity: Moderate to good
Properties:
Good tinting strength
Used in printing inks, plastics, and coatings
3. Titanium Dioxide Blended Pigments
Base Pigment: Titanium Dioxide (TiO₂) for opacity
Method: Mixed with organic pink dyes or pigments
Properties:
Very high opacity (TiO₂ scatters light strongly)
Soft pastel pinks to strong vivid shades
4. Pigment Red 81 (Rhodamine-based)
Chemical Class: Xanthene dye lake
Color: Bright neon-pink
Opacity: Moderate; often semi-opaque
Properties:
Brilliant color, less lightfast
Used in cosmetics and fluorescent inks
⚗️ Composition & Chemical Aspects
Inorganic pigments (e.g., TiO₂-based): High opacity, good stability
Organic pigments (e.g., Quinacridone, Naphthol): More vivid, but usually need help from opacifiers like TiO₂
Lakes and dyes: Derived from soluble dyes precipitated with metal salts to increase insolubility
🧪 Key Properties
Property Description
Opacity Depends on pigment type; enhanced with TiO₂
Lightfastness Excellent in quinacridone, moderate in naphthol
Oil Absorption Varies, higher in organic pigments
Toxicity Generally low; some cadmium-based pinks are restricted
Heat Stability Good in most modern pigments (e.g., used in plastics)
🖌️ Common Applications
Industry Usage
Paints Decorative coatings, artist paints
Plastics Masterbatch colorants
Cosmetics Lipsticks, blush, eyeshadow
Textiles Dyeing and printing
Printing Packaging, magazine inks
✅ Selection Tips
For high durability: Use quinacridone-based pigments (PR122)
For cost-effectiveness: Naphthol pinks (PR170) are widely available
For cosmetics: Use FDA-approved lake pigments like D&C Red No. 27
For high-opacity pinks: Combine with titanium dioxide