Glow in the dark paint is as safe as any other paint that comes into contact with kids. This is because the phosphors themselves are harmless as long as they are not ingested, just like the toxic elements that are part of virtually all manufactured paints. ... However, like any paint, they need to be applied with care.

Is phosphorescent paint toxic?

Tritium glow tubes are only useful for about 25 years because 3/4 of the tritium has decayed away by then – two half-lives. A major disadvantage of light activated phosphorescent paints is that they lose their glow within hours if not “recharged” by brighter light. Ingesting radium paint daily is indeed dangerous.

Is phosphorescent safe?

Radioactive phosphors

Radium, a radioactive element, is used here so that it can constantly energize the phosphor in the dials instead of light to make the watch glow. ... It is relatively safe compared to radium as it doesn't emit alpha particles.