This woven fabric has 80% blackout lining. This woven lining has black thread in the warp and cream thread in the weft, to give the semi blackout effect. This fabric is the inner layer of fabric that is sewn behind curtain fabric, which hides the raw edges of seams.
This lining is soft, and therefore allows curtains to still maintain folds and pleats. This lining acts as a protective barrier for your curtains from sunlight, or condensation which could cause mould.
Please note, this does NOT apply to the bleach white. The bleach white is simply heavy-bodied lining.