The PFSO Pigment Fluorescent Shortwave Organic also reactive in 365 nm light. Much higher and it will not fluoresce. We have a lot of pigments to choose from. The invisible pigments are white to off white, while the visible has color in regular light and under black light. The visible use 5-15% loading. The invisible depends on your application. The organic pigments tend to be brighter and can be milled finer. While the inorganics are duller and can not be milled.