1.dispearing ink 2. Able to doodle on paper, clothes, sheet, furniture, wall etc 3. ... Product Features: 1.dispearing ink2. Able to doodle on paper, clothes, sheet, furniture, wall etc3. dispearing in ... 12hours•Magical Pen with Invisible Ink•It writes as smoothly as common pen with ... or signs after several hours•World advanced invisible ink technology•Same size as normal pen, portable ...