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Letter Re: House Window Blackout Materials

James,
I heard you in your recent interview on the SGT Report podcast talking about [the need for] interior blackout material [to stop light from escaping windows when the power grid is down.]    What is the name of the material and tape and where can I purchase it? Thanks, Paul Z.

JWR Replies:

You will find the information you need in these archived discussions [1] in SurvivalBlog. Also see this theatrical supply company [2], and specifically this blackout fabric [3] and this blackout tape [4].