Black'Out Curtains........Light'Lock Curtains. I have raised this subject on several occasions and on several different forums. It never seems to generate any interest. I happen to think it is very important for post'SHTF security. Not to be a sexist pig........but I think if a Lady was looking for a hobby/work at home business. That taking orders and making custom "Black'Out" Curtains would be worth a go. A lot of creative thought could go into the design. Dull flat black on the outside then some thermal middle, and a highly reflective inner face to enhance candle light or lantern light, etc. light on the inside.