| abstract |
(57) [Problem] To provide a near-infrared fluorescent compound useful for labeling a thermoplastic polymer material. Kind Code: A1 Near infrared detection upon exposure to electromagnetic radiation having sufficient near infrared absorbance and being useful for “labeling” thermoplastic polymers or mixtures thereof and having a wavelength of about 670 to 2500 nm. A thermostable near-infrared fluorescent compound that provides fluorescence detectable by an instrument. |