Jisho

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Noun
1. fluorescent dye
Wikipedia definition
2. Optical brightenerOptical brighteners, optical brightening agents (OBAs), fluorescent brightening agents (FBAs) or fluorescent whitening agents (FWAs) are dyes that absorb light in the ultraviolet and violet region (usually 340-370 nm) of the electromagnetic spectrum, and re-emit light in the blue region (typically 420-470 nm). Fluorescent activity is a short term or rapid emission response, unlike phosphorescence, which is a delayed emission.
Read “Optical brightener” on English Wikipedia
Read “蛍光染料” on Japanese Wikipedia
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