Definition
A paint containing pigments that absorb light energy when exposed to a light source and then continue to emit a soft glow for a period of time after the light source is removed. Used on instrument markings, panel placards, and emergency signage so they remain visible in the dark after the cockpit or cabin lights are switched off.
Plain English
Paint that soaks up light while a lamp is on and then keeps glowing on its own for a while after the lamp is turned off, so markings can still be read in the dark.
Context Anchor
Seen on some cockpit markings, cabin markings, emergency labels, or older instrument and switch markings that need to remain visible in low light.
Derivation
From the Greek 'phos' meaning light and 'phoros' meaning bearing or carrying — literally 'light-bearing.' The name reflects how the paint carries light energy and releases it slowly as a glow.
Why Pilots Care
Keeps critical cockpit markings readable at night or after electrical failure without batteries or external light.
Analogy
Like a glow-in-the-dark sticker on a child's ceiling — bright after the light is turned off, then slowly fading as the stored energy is released.
Grounding Statement
After the paint has been exposed to light, it can glow on its own for a while without being connected to an electrical power source.
Intuition Check
Phosphorescent does not mean the paint makes light forever. It must first be exposed to light, and its glow fades with time.
Example Sentence 1
The emergency exit signs were coated with phosphorescent paint so they would remain visible if cabin power was lost.
Example Sentence 2
Technicians applied fresh phosphorescent paint to the fuel shutoff valve handle for better emergency identification.