What Is Fluorescent Brightener?
Direct Answer
A fluorescent brightener (optical brightener) makes materials appear whiter by absorbing UV and re-emitting blue light; migrating brighteners are restricted in hygiene products.
Key Takeaways
- A fluorescent brightener (optical brightener) makes materials appear whiter by absorbing UV and re-emitting blue light; migrating brighteners are restricted in hygiene products.
- How it works: Brighteners convert invisible UV light into visible blue light, counteracting yellowing for a brighter white look.
- Hygiene product standards ban detectable migrating fluorescent brighteners
- Myth: All whiteness comes from brighteners. Natural whiteness (whiteness index) can be high without them
How Fluorescent Brightener Works
Brighteners convert invisible UV light into visible blue light, counteracting yellowing for a brighter white look. In diapers, pads and wipes, the safety concern is migration to skin. Standards require no detectable migrating brightener. Whiteness index testing distinguishes natural whiteness from brightener-treated materials.
Examples and Applications
- Hygiene product standards ban detectable migrating fluorescent brighteners
- UV examination detects whether brighteners transfer to skin contact surfaces
Fluorescent Brightener vs. Related Terms
| Term | What it is | Key difference |
|---|---|---|
| Whiteness index | Fluorescent Brightener | Whiteness index measures natural whiteness; brighteners artificially boost apparent whiteness via UV conversion |
Limitations and Common Misconceptions
- Myth: All whiteness comes from brighteners. Natural whiteness (whiteness index) can be high without them
- Myth: Brighteners are toxic. The restriction targets migration; brighteners themselves are common in textiles
Are fluorescent brighteners banned in diapers?
Migrating brighteners are restricted — standards require no detectable transfer to skin.
How are brighteners detected?
UV-light tests reveal whether fluorescent substances migrate from the material.
References
- GB 15979-2024 一次性使用卫生用品卫生要求 (Hygienic requirements for disposable sanitary products) — 国家标准 (accessed 2026-08-02)
- JP CIA (industry) - Baby diaper material: key components and their functions — 行业媒体 (accessed 2026-08-02)