The ink used is not really visible in IR light (aka the night vision used by doorbells among other things).
You can get these ultra thin, custom print balaclavas. They’re literally just a thin pantyhose like material, and cheap textile paint.
And with much of the plastic we use today that appear to be completely opaque to our eyes, IR blocking is usually not an important aspect for these paints, so the IR floodlight of the doorbell goes right through and reflects from the mask only, making it appear as if it was just an empty mask.
Fun fact, it’s probably because the mask is a screen vs “thin”. Think bug net with paint on the outside. Here is an example of the effect on a screen door: https://youtube.com/shorts/5NtBevlKpx4
Probably not, though. The camera is head on, and the painted surface is from the angle of the camera…
Even in your video, the painted surface is clearly visible from the outside even on camera, whereas the unpainted side doesn’t show the paint - logically.
But in our case the key effect is that we’re looking at the PAINTED side, yet don’t see the paint itself. Which is primarily because of the IR effect I described - the pigment in the paint reflects the visible range of light (so the paint is visible), but not IR, therefore the IR camera in the doorbell “sees through” the paint.
The ink used is not really visible in IR light (aka the night vision used by doorbells among other things).
You can get these ultra thin, custom print balaclavas. They’re literally just a thin pantyhose like material, and cheap textile paint.
And with much of the plastic we use today that appear to be completely opaque to our eyes, IR blocking is usually not an important aspect for these paints, so the IR floodlight of the doorbell goes right through and reflects from the mask only, making it appear as if it was just an empty mask.
Fun fact, it’s probably because the mask is a screen vs “thin”. Think bug net with paint on the outside. Here is an example of the effect on a screen door: https://youtube.com/shorts/5NtBevlKpx4
@snoons@lemmy.ca, @starblursd@lemmy.zip
Probably not, though. The camera is head on, and the painted surface is from the angle of the camera…
Even in your video, the painted surface is clearly visible from the outside even on camera, whereas the unpainted side doesn’t show the paint - logically.
But in our case the key effect is that we’re looking at the PAINTED side, yet don’t see the paint itself. Which is primarily because of the IR effect I described - the pigment in the paint reflects the visible range of light (so the paint is visible), but not IR, therefore the IR camera in the doorbell “sees through” the paint.
Awesome. Good to know for next time I want to eat a banana.
The more you know