Glow-in-the-dark Yarn: This crochet yarn glows in the dark after 20-30 minutes of sunlight or ultraviolet light. The dimming of light over time is a normal phenomenon that can be achieved by repeatedly absorbing light. Different colors of knitted yarn reflect different light sensitivities to the eyes Chenille Premium Material: This glow in the dark yarn is made from high-quality chenille. Glow in the dark yarn for crochet is soft, plush and irresistibly comfortable, making it ideal for making comfortable items. Our thick yarn is durable and has a unique texture that makes it ideal for artisans of all ages Dimensional Detail: Each velvet yarn