Texas Red is a red fluorescent dye , used in histology for staining cell specimens, for sorting cells with fluorescent-activated cell sorting machines, in fluorescence microscopy applications, and in immunohistochemistry . Texas Red fluoresces at about 615 nm, and the peak of its absorption spectrum is at 589 nm. Solutions can be excited by a dye laser tuned to 595-605 nm, or less efficiently a krypton laser at 567 nm. It is commonly used in molecular biology techniques like quantitative RT-PCR and cellular assays.

Optolong Optics Co.,ltd is the brand owner of optolong who is a manufacturer of astronomy filters, fluorescence filters. We also offer other interference filters like UV filters, visible filters and Near inferred filters, beam splitter, anti-reflection coating and optical mirrors as a OEM service.

Located in Kunming city in China which is one of the four optics center and the coating experience of 18 years (since 1999) enable us to design and produce the filters with most sophisticated spectrum.

We are glad to declare that Optolong has been become the first and only non-replaceable brand for astronomical filters in China. Optolong brand is also known as the comparable filters with international brand by distributor client around the world.