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Photochromic Dyes – Ranbar Red DP1610

Ranbar Red DP1610 is a colorless to deep red photochromic dye based on Spirooxazine. Photochromic dyes with Spirooxazine structure exhibit excellent resistance to light fatigue.

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Ranbar Red DP1610 Colorless to Red Photochromic Dyes


Name: Photochromic dyes

Model: Ranbar DP1610

Chemical Structure: Spirooxazine

Color Change: Colorless to deep red

Characteristics: High transparency, high photosensitivity, bright color

Applications: Plastics, coatings, paints, printing inks, textile printing and dyeing


Product parameters:

Temperature resistance220°C
Melting point165°C~167°C
Flash point [°C]>200°C
UV absorbance317nm
Moisture content (%)<1%
Physical stateWhite crystalline powder



Soluble: Toluene, dichloromethane, acetone, methyl ethyl ketone, ethyl acetate, DMF (dimethylformamide), methanol, tetrahydrofuran

Slightly Soluble: Alcohol, IPA (isopropyl alcohol, 2-propanol)

Insoluble: Water


Molecular change structure diagram of Ranbar photochromic dyes


Product Description:
Ranbar Red DP1610 is a colorless to deep-red photochromic dyes based on Spirooxazine. It is an organic dye, appearing as white crystalline powder, soluble in various organic solvents such as toluene, ethyl acetate, acetone, methanol, and tetrahydrofuran. Its solution changes to deep red upon exposure to ultraviolet light and returns to colorless state upon removal of UV light.


Color change principle:
When photochromic dyes are exposed to sunlight or ultraviolet light, the dyes are excited and undergo a change in molecular structure, resulting in a visible color. Once sunlight/UV light is removed, the dyes revert back to their colorless form. It is important to note that photochromic dye molecules do not exhibit color-changing reactivity in their crystalline state; they need to be dissolved in a solvent or polymer to demonstrate color-changing effects.


Product application:
Ranbar photochromic dyes are widely used in industries such as printing inks, paints, plastics, and textile printing and dyeing. They are extremely easy to use, requiring only to be added to the base material and thoroughly mixed. The lower the proportion mixed into the medium, the more transparent it appears in its colorless state or in thin layers. It’s important to note that mixing generates heat, which may temporarily alter the color of the mixture.


Ranbar UV Color Changing Dye Model Chart


Application in Ink and Coating:

  • Recommended dosage in paint and ink applications is 0.02% to 0.1% (w/w).
  • Suitable pH range for the chosen matrix is 7-9.
  • Suitable for silk screen printing, gravure printing, flexographic printing ink, etc.
  • It is recommended to print on a white or light-colored background.
  • When using photochromic dyes on different substrates, choose appropriate resins or bases.


Application in Plastics:

  • Recommended dosage in plastic applications is 0.01% to 0.1% (w/w).
  • Ranbar photochromic dyes can be used with other pigments and organic dyes.
  • Avoid using photochromic dyes at processing temperatures above 250°C.
  • Suitable for PP, PE, PVC, PU, PS, ABS, TPR, EVA, PA, PMMA, and other plastics.


Storage and Handling:
Ranbar photochromic dyes should be kept dry at room temperature and should not be exposed to sunlight.


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