How to show the luminous effect: after the whole pattern is scraped, use a torch to shine on the pattern for a few minutes, or take the scraped paper directly under the electric light to shine. Warm tips: 1. The luminous effect needs to be reflected in a dark environment. 2. The strength of the glow-in-the-dark with the light of the time, the longer the light of the time, the glow-in-the-dark will be brighter and more durable! These are perfect for almost anyone - a friend, family member, teacher, child or coworker. Glow in The Dark Scratch Art Rainbow Painting Paper - Arts Crafts Supplies Kits Drawing Paper They are fun and unique! - It's a funny and innovation toy for boys girls, also a very good way to train hands-in skills,intelligence development, The funny and easy game makes it an ideal gift option for child and curious adults! - Enjoy de-stressing art therapy. Can release work pressure and also can pass the time. I believe when you finish your scratch art you will have bright mood and feel much more relax. Ideal creative gift,Great present for birthday,children's day,mother and father's day,valentine's day,wedding anniversary,anniversary celebration,Christmas, Thanksgiving etc. suitable for any type of festival. Your gift problem is solved!