bambancin launi:

Launi shine fuskar launuka daban-daban, shine babban alamar bambanta launuka daban-daban, kuma sunaye daban-daban na launuka daban-daban, kamar ruwan launi, ja, shuɗi, dusar ƙanƙara da sauransu.

To, menene launin wani abu ke yanke shawara? Launin abu yana da tsarin tsawon raƙuman ruwa da tushen haske ya fitar da kuma yanayin farfajiyar abu, ba shakka ikon tunanin farfajiyar abu yana da alaƙa da launin abu. A lokacin buga jakar hannu yana buƙatar ƙwararrun ma'aikata su fahimci launi sosai, saboda kawai tare da kyakkyawan fahimtar launi zai iya tabbatar da kwatancen launin launi na wanda.