Brother 4in Glow-in-the-Dark Continuous LabelBrother 4in Glow in the Dark Continuous Label High Visibility Signage for Home and Office Keep essential signage and safety information legible even when the lights go out. The Brother 4 inch Glow in the Dark Continuous Label roll is engineered to shine after just under 30 minutes of light exposure, delivering 6+ hours of readability in darkness. This makes it an indispensable labeling solution for busy homes, offices, and workplaces where clear