Warm TipsQUESTION: Will it definitely glow at night after full day of direct sun?ANSWER: Not so because the light absorption will be saturated when the sun is slowly setting it is already releasing the light source. It may not be obvious at night so no matter day or night it only needs to be irradiated with a light source for 10-20 minutes and it will glow in the darkglowing rocks do not glow all night. There is a time limit. It is recommended not to spread them scatteredly.Product SpecificationsMaterial: ResinColor: BlueDiameter: 0.8"-1.2" Thickness: 0.3"Quantity:200pcs/package