Fluorescence is the phenomenon in which absorption of light of a given wavelength by fluorescent molecule is followed by the emission of light at longer wavelengths. The distribution of wavelength-dependent intensity that causes fluorescence is known as the fluorescence excitation spectrum, and the distribution of wavelength-dependent intensity of emitted energy is known as the fluorescence emission spectrum.

Fluorescent pigments consist of a fluorescencing agent locked in a transparent organic resin matrix which can be added to a variety of mediums, such as plastics, paints, aqueous coatings, etc., The final effect is a colored surface which is bright and glows compared to other ordinary substrates.

All colored surfaces fade when exposed to day light, this fading is also caused by the UV wavelengths. The UV light breaks down the chemical bonds within the pigments themselves and eventually makes any colored surface white or transparent. Different types of pigments can withstand this attack to varying degrees and fluorescent has the lowest tolerance and therefore fade the quickest.

What are Night glow / Luminescent Pigments and what makes difference between fluorescent and luminescent pigments?

Luminescent pigments are glow in dark i.e., glow after light source is removed. Where as fluorescent pigments glow in presence of light source only.

The objective of both the materials are to deliver color for the medium, when the material dissolves in the medium it is called to be as dye, when the material disperses in the medium it is said to be pigment.

Pigments like CPC/Pigment violet 21 etc., Fluorescent pigments consists of 95% white transparent organoresenous particles, colored with 5% fluorescening agent where as other ordinary pigments consists of 100% coloring agents there by strength of the pigment is high. To attain the required color small concentrations are enough.

The quality of fluorescent agent is measured in terms of particle size, size distribution, thermal stability, solvent resistance, compatibility towards the substrate, brilliancy etc.

Yes, Provided same quality and conc. of fluorescent pigments, with consistent quality of pigment associated chemicals with identical parameters we can achieve consistent shades.

Slight variation in the particle size affects the physical appearance of the pigment and compatibility towards the application. Fine particle size provides good coverage and good hiding power compared against bigger particles. Generally small particles with low strength give better results than bigger particles with higher strength.

(Non fluorescent pigment) No, Non-fluorescent pigment can destroy the brilliancy, strength of fluorescent pigments. Ultimately no fluorescence observes at end application.

As the specific gravity of fluorescent pigments less compared to water, they float on water, with thorough mixing of pigment with binder, dispersing agent we can disperse fluorescent pigment in water easily.

No, Fluorescent pigments are free from toxic and hazardous elements. Our fluorescent pigments are in compliance with EN-71, Part 3, 1988 and approved from Duke University for non-hazardous and non-toxicity. They are absolutely non radioactive.

The measurement of light fastness / fading of any color measured in Blue Wool Scale the ratings are 1-8. BWS Reading 1 Stands for Very poor -----8 Stands for out standing / Excellent.
Fastness Rating Equivalent General

Generation of foam is the universal problem, The foam is generated due to air entangled along with the solid materials while addition. By addition of deformers and slow addition of solids into liquid can minimize the generation of foam. Pre wetting of pigments with low viscous liquids can also prevent foam.