There are numerous window treatments available on the market today that are labelled and sold as block out products. By definition, the term “block out” means allowing no light to pass through.

Note that the definition specifies “no light.” If indeed even a small amount of light passes through a product – five per cent or more – that product is then categorised as “dim out” or maybe even “translucent.” So what should one expect when purchasing a block out window covering?…