Hair dye has become an almost indispensable product for many different men and women. Many ladies and girls have their hair dyed on a regular basis through a salon or at home. However, apparently women don’t like their hair because more women are changing the color of their hair than ever before. But is this obsession with finding the perfect color bad for our hair? The answer is: It depends.
A permanent dye is the longest lasting type of dye. However, these dyes are also the harshest on your hair. The dye uses ammonia and hydrogen peroxide to expand the hair molecules so that they are too big to be washed out. These dyes last until the new hair roots grow in. When you use it, it creates a new color base for your hair, and then re-dyes it to the new color. For this reason, the same base color looks different on other people.
Semi-permanent dyes are the kind that most people use when they visit the hair salon. They are a little less harsh than the permanent dyes, but they last longer than the temporary dyes. These dyes contain ammonia or hydrogen peroxide, and it is possible to get a lighter shade with these dyes. When the dye is placed in the hair, the dye penetrates the hair shaft, and then bonds with the hair molecules already there. This dye usually lasts for about a month.
A temporary die is usually sprayed on, or it can be applied in a gel or mousse. When the hair gets wet, the dye runs out of the hair. This can be very messy. The reason that this happens is that there is no bonding of molecules with this kind of dye.
Ammonia and hydrogen peroxide are the main components that keep the hair dye bonded to the hair. They are able to seep inside the hair follicles, taking the dye with them. That is how the dye stays on the hair for longer periods of time. However, there has been some research to suggest that certain chemicals in hair dye can lead to certain cancers.1-Fluoro-4-nitrobenzene (also known as 4-Fluoronitrobenzene or p-fluoronitrobenzene, the CAS number is 350-46-9) is also used in hair dyes.
The FDA has backed off of approving coal tar dyes; if the box has the patch test instructions, that’s all it needs. The problem with continued use however, is that someone can develop an allergy later on in life. Another problem to the hair emerges when women have their hair straightened and colored, too. Also, overuse of dyes, dye sitting too long to develop, and other variables can damage hair. This will typically mean breaks in the shaft of the hair.