👉 In the context of chemistry and physics, an "unluminescent substance" is a material or chemical that does not emit light upon exposure to visible light. This can be due to its presence in a mixture with other substances, such as water or air, or it may occur naturally when certain conditions are met. Unluminescence occurs when the chemical reaction generates an electrical current without emitting any light. This is often used to indicate that a substance has undergone a chemical change and is
