SJH glow-in-the-dark ink white and green glow test: absorbs light and glows in the dark with lasting afterglow - for safety signs, fire exit marks, toys and night products.
A full written description of the demonstration, so the content is readable without playing the video.
This video demonstrates the glow performance of SJH glow-in-the-dark ink: it charges in light and glows in the dark, with white and green glow effects compared side by side - for safety signage and night products.
The video first shows the printed pattern under normal light, where the white glow effect appears as a pale overlay with little visual difference from ordinary printing. Glow pigments are mainly rare-earth aluminate phosphors that do not emit in light, so the product appearance is unaffected in normal use.
The camera switches to a dark environment; the pattern begins to glow and then shows an afterglow that fades slowly over time. Brightness and afterglow duration depend directly on excitation light intensity and duration and on film thickness: fuller excitation and thicker film give higher initial brightness and longer afterglow. What the video shows is the typical appearance in real use.
The video shows both white glow and green glow for comparison. Green is the band to which the dark-adapted human eye is most sensitive and gives the best recognition in the dark, which is why green is standard for fire evacuation signage; white glow blends better into light-coloured designs.
| Mechanism | Phosphorescent material that stores light and releases afterglow in the dark |
|---|---|
| Factors | Excitation intensity and duration plus film thickness set initial brightness and afterglow length |
| Options | White glow / green glow (most sensitive to dark-adapted vision, best in the dark) |
| Typical use | Safety signage, fire evacuation signs, toys and night products, creative packaging |
The practical measure of glow ink is afterglow performance, not whether it glows at all - every phosphorescent product glows in the dark; the difference is how long and how brightly. For safety-related uses such as fire evacuation signage, specify an afterglow duration and request a proof for measurement; for toys or creative packaging, focus on whether the daytime base colour suits the design. Green gives the best recognition in the dark and is recommended for safety applications.
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