Darkens not

The curtain was delivered quickly. The color is slightly different from the advertised product from (instead of bright green rather something olivaceous). We bought a blackout curtain. As the product delivered darkened no piece, I was only starting from a mistake. However, also speaks of the delivery of a blackout curtain. The material is contrary to the description not about three layers, but a simple single-layer fabric, similar to a thin synthetic fiber-shirt. The daylight is not obscured, but only colored green. It does not fulfill its purpose and was returned immediately.