When the contrast between hair and skin color is minimal and when the hair is very blonde, hair loss does not show well in such people. I have seen many people in the office over the years that have platinum blonde hair and a blonde or fair skin color and the hair loss does not stand out. Contrast that with a man with fair skin color and black hair (most Asians) especially when their hair is straight, and the balding stands out with less than 50% hair loss. I believe that a platinum blonde person can lose 85% of their hair if it is a distributed loss without seeing the loss.