I have just finished making a couple of solar shades for the upcoming solar eclipse on March 9, 2016. These shades use a Baader Neutral Density 5.0 solar filter, a specialized filter sold in most astronomy shops.
If you do not have access to a solar filter, you may use instead what is called a no. 14 welder’s glass, available in most local hardware stores.
Note that it is not safe to use other grades of welder’s glass such as no. 10, 11, 12, and 13. Other improvised filters are also not safe. Use only either a commercially-available filter or a no. 14 welder’s glass. Using substitutes such as X-ray films, photo negatives, sunglasses, dark or smoked glass, or any other make-shift filters will not protect your eyes from the Sun’s harmful radiation.
Solar Eclipse on March 9, 2016
Solar Eclipse Observation featured on GMA 7 (May 21, 2012)
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© Anthony Urbano (Manila, Philippines)