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Term
Definitions
- Fluorescence: The emission
of electromagnetic radiation, especially of visible light, stimulated
in a substance by the absorption of incident radiation and persisting
only as long as the stimulating radiation is continued.
- Phosphorescence: Persistent
emission of light following exposure to and removal of incident
radiation.
- Pigment: In Angstrom's product
descriptions this term is used to imply that the compound is generally
insoluble in most solvent systems.
- Dye: In Angstrom's product
descriptions this term is used to imply that the compound is generally
soluble in either solvent or water based systems.
- Organic: In Angstrom's product
descriptions this term is used to classify materials that can
be milled to customers specifications and can also be used as
mixtures.
- Inorganic: In Angstrom's
product descriptions this term is used to classify materials that
are only available in specified particle sizes. This type of material
can not be milled without a subsequent reduction in the fluorescent
intensity. However they are extremely lightfast and are generally
priced lower than the organic materials.
- Ultraviolet (UV): Of or relating
to the range of invisible radiation wavelengths from about 4 nanometers,
on the border of the x-ray region, to about 380 nanometers, just
beyond the violet in the visible spectrum. Unless otherwise specified,
UV refers specifically to UV-A (380-315 nm).
- UV excitation Color: The
visible color produced by a substance when excited by UV. Unless
otherwise specified, the UV excitation wavelength is specifically
365 nm.
- Fluorescence/phosphorescence
emission: The specific wavelength(s) produced by a substance when
excited by UV. Unless otherwise specified, the UV excitation wavelength
is specifically 365 nm.
- Lightfastness: In
Angstrom's product descriptions this term is used to rate the
resistance of a material to degradation caused by prolonged exposure
to visible light
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