It's also important to note that you cannot use regular sunglasses to view the Eclipse, no matter how dark the lenses are on the glasses.
The lab has special equipment that tests the filters on eclipse glasses to determine how much light passes through, which is hard to tell with just the naked eye.
Here is a list provided by the American Astronomical Society of telescope and Solar-filter companies that sell eclipse glasses that have been verified by an accredited testing laboratory to meet the ISO 12312-2 international safety standard.
Note: Baader Planetarium's AstroSolar Safety Film and AstroSolar Photo Film, sold in the U.S. by Alpine Astronomical and Astro-Physics, are not certified to meet the ISO 12312-2 international safety standard and are not designed to work as eclipse shades or handheld solar filters.
Baader's AstroSolar Silver/Gold Film, on the other hand, does meet the ISO 12312-2 safety standard for filters for eyes-only direct viewing of the Sun.
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