Originally Posted by Dean Sensui
I recently used some black weed block that I happened to have in the storage shed. Doubled it up so that it's a little more opaque.
It killed the hard sunlight that would have hit the subject directly. It's not dense enough to black out a room. But it's certainly more than enough to stop direct sunlight.
mulching film comes in two or more thicknesses. The thicker variety is almost 100% opaque.