Nabil requested for an invisible pen for quite sometimes. I bought it for his birthday earlier this month. In fact, I bought 6 for my other sons, nephew, niece and cousin Jaja. I just drew something on the brown paper. Can you see it?
Click the light and voila!
Then, they were experimenting with other materials such as wood, MY LEATHER HANDPHONE COVER and of course, SKIN. (Aunty Ani started it first ;p)