I purchased some handpainted yarn for knitting dd#2 some soaker shorts. I started knitting today and found little bits of plant material (like little bits of dried grass or twigs). The plant material is pretty small, but I'm still a bit annoyed. What should I do? Is this normal? I've never purchased handpainted yarn before, I usually just go to my local yarn store or kool-aid dye my fisherman's yarn.