Some tables may be painted with luminous paint. Most are not luminous.

The salt present in luminous paint is typically a phosphorescent material called strontium aluminate.

Luminous paint contains phosphors that absorb and store light energy, which is then slowly released over time, causing the paint to glow in the dark. This paint is commonly used on clock faces to make them visible in low-light conditions without the need for external lighting.

In modern times, Cobalt-60 is the substance used to make self-luminous paint. Cobalt-60 has replaced Radium's use for the same applications due to Radium's radiation danger.

Promethium