Letter Re: How to Make Your Own “Black Out” OPSEC Window Panels
Sir, In the film industry we use a very cheap and very opaque product to block out windows. We often need to shoot [indoor] night time scenes during the day and can’t have any stray light. Product is called Duvetyne, it’s a very, very heavy black cloth. We even use it for flags and cutters, which are light-blocking pieces that we put in front of lights as big as 20K (20,000 watts) to deflect and control stray light. This stuff works great. Here is a supplier of Duvetyne. Has it for $8.25 per yard (60″ wide), so it really is …