Izikhanyisi ze-Optical ziikhemikhali zokwenziwa ezongezwa kwi-liquid kunye ne-detergent powder ukwenza iimpahla zibonakale zimhlophe, zikhanya kwaye zicocekile.Ziindawo zale mihla zokutshintsha indlela yamashumi eminyaka yokufaka bluing ukongeza amanani amancinci edayi eluhlaza okwesibhakabhaka kwilaphu ukuze libonakale limhlophe.