Longwave ultraviolet (UV) substances will fluoresce in the range of 340nm to 405nm.  Fluorescent materials will vary in what frequencies will excite them and what frequencies they emit.  Some longwave UV substances will fluoresce as well in short wavelengths as low as 250nm (e.g  UVXPBR) and and high as 405nm (e.g UVXPBB, UVPA, UVPW).  You should make sure that your UV excitation source matches with the excitation frequency of the fluorescent material.  For example, our UVXPBR can be excited with 250-390nm UV light, but, optimally, you want a 350-375nm light source.  By 390nm, the UVXPBR will fluoresce, but instead of emitting a bright red, the color will be a paler pink.

We have UV powders, inks and dyes.  Some UV powders have solubility.  Most materials can be made into a suspension or dispersion using a clear water based acrylic or solvent based clear coat.

As a general rule of thumb, if the UV substance is soluble and/or organic, then the substance will degrade under sunlight after a week or so.  This is because most UV soluble substances are made of organic chemicals that are destroyed by sunlight.  When these substances are not exposed to sunlight, they retain their fluorescent properties indefinitely.

UV substances that are UV stable are generally non-soluble.  Typically, they are made of very fine crystals that can withstand very high heats, intense light for years, but cannot be dissolved by solvents.  The non-soluble UV powders usually have a particle size of 10 microns or less.  We can create liquid suspensions or dispersions using these powders so that they can be used like a paint or ink.

We have UV substances that

Have low visibility under regular light but fluoresce under UV lights.  These substances are good for invisible marking, security tagging, anti-theft tracing and any application where you don't want the substance visible normally.  We have both soluble and non-soluble low visibility normally / high visibility under UV substances.  Examples are:

• UVXPBR, UVXPBB, UVXPBY - soluble UV powder colors
• UVPW, UVPA, UVPN - soluble & non soluble blue / white
• UVLWG, UVLWR, UVLWB - sunlight stable UV powders non-soluble
  

We have high visibility under daylight and even more visibility under UV light.  These substances are good for visible marking, leak detection, batch contamination and anti-theft tracing.  We have both soluble and non-soluble high visibility normally / high visibility under UV substances.   Examples are:

UVHG - daylight fluorescent soluble powder

UVHiVisLY, UVHiVisOR, UVHiVisOY - daylight fluorescent 

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