If you wear glasses, purchase welding goggles that fit over them, with a single rectangular window.
Congo Blue is sold as ROSCO 382 or LEE C181 by two major brands. Primary Red or Medium Red is sold as ROSCO 27 or LEE C106.
If you’re making multiple goggles and don’t have enough room on your lighting gel sheet, you can get away with three blue layers and one red layer per lens. Handle carefully and minimize contact with the gels. Scratches and oil from your fingertips can damage the plastic. [4] X Research source
You may want to leave the red filter unattached for now, and see whether you like the goggles better with or without them. If you use only blue filters, you will have an easier time seeing in dim light, and notice a greater variety of colors.
If you’re worried about this, a layer of glass in the goggles adds some protection, and a layer of UV filter (available from the same stores that sell lighting gels) adds more. Even then, looking directly at the sun is not recommended, since too much infrared light can cause damage. [6] X Research source
Cut out squares of blue and red filters from your leftover lighting gels. Layer the two colors to make an opaque black barrier that looks transparent through the goggles. Hide messages behind the barrier. Most black permanent marker ink still looks dark in IR light. Find a dark T-shirt or other cloth that looks light grey through the goggles. Draw on it with the marker to make a message that blends in with the cloth until you put on the goggles.
Cover the lens with a Congo Blue filter to make the webcam into a daylight infrared sensor. This works with most digital cameras as well, but do not disassemble them unless you have electronics experience. A camera’s flash bulb is connected to a high voltage capacitor, which can remain dangerous even when the camera’s battery is removed. [7] X Research source
