Why Does White (or gray, light blonde, highlighted) Hair Turn Yellow: And what to do about it
This applies to white or gray, highlighted and blonde or light brown hair that may tend to become brassy or develop an unnatural color tint - yellow, red, orange or greenish. White hair has no pigment. Although sometimes that's not entirely the case as a hair turns white. And sometimes there's a dark medulla to add color. The lighter your hair overall, the more likely discoloration from any source will show. What causes yellowing of light-colored hair? Water chemistry: Hardness or natural minerals, chemicals used for water treatment, seasonal water chemistry changes all impact whether or not your water discolors your hair. For example, if your water source comes from lakes and rivers, it varies greatly (within drinkable limits) with changing seasons and the treatment needed to make the water safe to drink. Some water is high in iron which can give hair an orange, red or yellow cast. Other things in water (metals) can cause green or brown discoloration. Alkaline water can be al...