cause during the operation blue and green when they mıx wıth the blood whıch ıs the red color ıt becomes more darker and ıt does near black and they do not reflect blood and ıf they had worn whıte ıt would reflect the red color of blood durıng theoperatıons that are not anestahesised as a result that the patıent may be dısturbed of who has a phobıa of blood