in another embodiment the roll was protected by wrapping the roll with an external film the external film was about 1 to 20 extra wraps of desiccating interleave that sacrificially prevents moisture from getting to the rest of the roll even when part of the roll is removed and the pvb is used to make laminates a low moisture content can be maintained and shelf life extended for the rest of the roll by repackaging and subsequent storage with the remaining desiccating interleave the thermochromic performance in the pvb was increased by the removal of moisture by the desiccating interleave the longevity predicted by accelerated durability in a xenon arc light exposure chamber also increased also the desiccating interleave kept the thermochromic pvb layers from sticking to each other and thereby kept the roll from blocking when pvb is used as an interlayer between two pieces of glass to make a sheet of laminated safety glass it is preferred that the pvb have rough textured outer surfaces the surface should be sufficiently roughly textured to allow air to be expelled from the glass pvb glass three layer stack when the stack is passed through a heated pinch roller to tack the film to the glass sheets and create an edge seal for later autoclave processing the textured outer surface on the pvb can be induced by surface melt fracture or by embossing the pvb layer on one or both sides it has been discovered that when pvb with a textured outer surface is interleaved with a desiccating layer with smooth surfaces.