If you put them on, everything should look PITCH BLACK. Then if you turn and look DIRECTLY at the sun or a bright, uncoated light bulb you should see a comfortable amount of light. The genuine certified glasses also block dangerous UV and IR radiation too. Here is a breakdown if you want to look into it more.
Here is a list of Reputable Vendors of Solar Filters & Viewers
Even if you won't get a shirt on time to wear it to the eclipse, you can still get one to show your enthusiasm and that you attended!
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