Watch Glossary
1356 horological terms explained · 2/2
Quality of luminous material to adhere properly to dial surface without peeling or degrading
Visual difference between luminous and non-luminous dial areas visible in darkness
Percentage and area of watch dial, hands, and indices coated with luminous material
Gradual loss of luminescence brightness and duration in watch hands and dials over extended time
Dial coated with luminous material for low-light visibility
Process of filling dial cutouts with luminous material for enhanced visibility and aesthetics
Duration and persistence of a watch's luminous glow, measured in hours of visibility in darkness
Consistency between luminous brightness levels on dial, hands, and markers in darkness
Aged appearance of vintage luminous material showing discoloration, yellowing, or browning over time
Resistance of luminous coatings to fading, degradation, and environmental exposure over time
Area of luminescent material applied to hands for extended visibility in darkness
Applied luminous hour markers on dial, typically rectangular shapes on vintage sports watches
Condition fault where luminous material flakes or peels from dial or hands due to age.
Photograph of a watch taken in darkness showing the glow of luminous materials on dial and hands
Amount of luminous material applied to watch components affecting brightness and durability
Consistent application of luminous coating across dial ensuring even brightness throughout
Advanced luminous material providing superior glow intensity and longer phosphorescence duration.
Hour markers filled with luminescent material enabling nighttime visibility
Seiko's luminous coating providing bright glow and long-lasting luminescence on watch dials
Measure of how brightly and for how long a watch's luminous material glows in darkness
Glow-in-the-dark hour markers and hands enabling underwater visibility in darkness.
Phosphorescent coating on hands and indices enabling visibility in darkness.
Radium-free glowing paint applied to watch hands and markers for low-light readability enhancement.
Indicator showing lunar month cycles, typically 29.5 days, advancing with gearing system.