These provide a popular way for viewing solar eclipses.
One viewing technique is to project an image of the sun onto a white surface with a projecting telescope.
Homemade filters or ordinary sunglasses, even very dark ones, are not safe for looking at the sun; they transmit of times too much sunlight.
These are much darker than the filters used for most kinds of welding.
If you have an old welder's helmet around the house and are thinking of using it to view the Sun, make sure you know the filter's shade number.
One excellent resource on how to determine if your viewers are safe can be found here: https://org/eye-safety/iso-certification Viewing with Protection -- Experts suggests that one widely available filter for safe solar viewing is welders glass of sufficiently high number.
The only ones that are safe for direct viewing of the Sun with your eyes are those of Shade 12 or higher.
Graphics-Only Solar Eclipse Safety Flyer Car Safety Planning to Drive the Eclipsehttps:// Camping Health and Safetyhttps://gov/family/camping/ Facility Activities Home Action.do?