Method 1: In the dark environment, more than 3 meters away from the reflective paste, the mobile phone opens the flash to take pictures of the reflective paste, you can see the obvious reflective effect.
Method 2: In the dark environment, more than 5 meters away from the reflective paste, put the flashlight in the nose, shine the reflective paste between the eyes, you can see the obvious reflective effect. The stronger the light, the stronger the reflection.
Method 3: In the dark environment, more than 20 meters from the reflective paste, sitting in the cab with the headlights to illuminate the reflective paste, you can see the obvious reflective effect.