try sally hansen 180 micro ball nail polish in clear to add a hint of sparkle to nymphs. will suggest gas bubbles trapped in shuck as they emerge. one bottle will last yrs of tying and is an easy and more realistic method of adding sparkle w/o overdoing it. tie the fly and add the polish at completion or prior to adding wing case. came upon this when looking to add spsrkle to salt water flies. comes in several colors and is available at drug stores and walmart.