Ultra Rainbow Fluorescent Particles are high-intensity, multi-peak calibration beads designed for advanced flow cytometry and fluorescence microscopy applications. These microspheres contain a precise blend of fluorescent dyes that emit across multiple channels of the visible spectrum, enabling simultaneous calibration of multiple detectors. Ideal for instrument standardization, spectral compensation, and quality control, Ultra Rainbow particles ensure consistent fluorescence performance across experiments. Their broad excitation and emission profiles make them compatible with a wide range of lasers, including 355 nm, 405 nm, 488 nm, 561 nm, and 633 nm. Commonly used in immunophenotyping, multiplex assays, and fluorescence intensity calibration, these particles are essential tools for researchers requiring high reproducibility and accurate fluorescence quantification.