The thin quality of Blending Filament allows you to create elements of subtle light reflection. It is often combined with cotton, wool or another thread type, in the same needle, to create a random metallic sparkle. The addition of one or two strands does not add weight to your thread, so you can use the needle size that accommodates the stranded cotton. Vary the amount of highlight or shimmer you want to add to a design by using one or more strands; use a single strand for the most subtlety or two strands for added effect.