Purpose of Test This test spectrophotometrically determines the light-blocking properties of textile from light passing through windows and light seen on the darkened side of the textile, like a curtain or drape. The spectrophotometric method is applicable to various fabric types: Knits Woven Nonwoven Fabrics taken from end product items This test is not recommended… Continue reading AATCC 203 Light Blocking Effect of Textiles: Spectrophotometric Method