As part of their extensive quality assurance efforts, Sferra uses a light box to examine swatches of each new dye lot. To ensure color consistency, they compare shade variations under the same light source as in Italy. Once they are in agreement with the weaving mill, they then allow the new fabric to be moved on to the cut and sew facility.
Sferra also uses the ultraviolet features of the light box to examine fabric in detecting the presence of optical brighteners, whitening agents, bleaches, and other harsh chemicals.
