Sunlight Stable

Sunlight stable inks are not as bright as the organic inks, but will last for years under sunlight.   The organic inks are much brighter and less expensive,  but will fade in about 1 week if left to sit under the sun.  Sunlight stable inks are phosphor dispersions or suspensions made using an acrylic binder that dries to a clear coating holding the phosphor to the surface.  The phosphors are small ceramic crystals that behave similar to rock dust.  They cannot be dissolved in solvents and are inert to over 1500 DegF.

To jump to the UV longwave ink section of our online store which has soluble and non-soluble inks, you can click here.

To jump to the UV longwave sunlight stable phosphor section of our online store, you can click here.


UVLWG - Ultraviolet Longwave green fluorescing non-soluble powder.

  • Excitation: 380nm peak
  • Emission: 518nm peakParticle Size (50%):
  • Particle Size (50%): 4 microns

UVLWR - Ultraviolet Longwave red fluorescing non-soluble powder.

  • Excitation: 360nm peak
  • Emission: 628nm peak
  • Particle Size (50%): 5 micron

UVLWB - Ultraviolet Longwave Blue fluorescing non-soluble powder.

  • Excitation: 350nm peak
  • Emission: 450nm peak
  • Particle Size (50%): 5 microns

These substances

  • Will not degrade under UV light, 
  • Are highly fluorescent
  • Can withstand heat over 1500 DegF
  • Have very low visibility under normal light
  • Particle size of less than 10 microns
  • Will not dissolve in solvents