Fabrics that are made from cotton or have a high cotton
content can take on moisture and shrink. For this reason, these
fabrics are not suitable for high moisture environments.
Slight cupping of the fabric may occur; this is typically due to
changes in humidity levels.
If the back of the fabric is different to the front of the fabric,
when the fabric is folded to create the pocket at the top and
bottom of the louvre, this will show the opposite side of the
fabric.
If the fabric is translucent, there will be darker areas where the
louvres overlap.
Where fabrics are stitched, there will be pin-holes in the fabric.
These will allow light to pass and will be more obvious on
darker/opaque/blackout fabrics.