Many questions come up when you're thinking about dying your hair, but one of the most important things to consider is which type of hair dye you should use. Not all are created equal, and which choice you make will determine how your color looks, how your hair looks, and how long the color lasts.
When to Choose Semi Permanent Hair Color
Semi permanent hair color is good for first-time dyers or for people who aren't looking to make a drastic change. Semi permanent dye has no ammonia and no developer, so no color is deposited inside the hair shaft. Instead, it coats the hair, which is why it's often referred to as a "stain" or "wash." Semi permanent is good for changing or enhancing tones but not for changing colors. It generally washes out in 6 to 12 shampoos.
When to Choose Demi Permanent Hair Color
Demi permanent hair color is good for people who want more of a change but do not want to damage their hair or do anything drastic. It contains no ammonia but does have a small amount of peroxide, which opens the hair cuticle slightly so that some color will sit in it. Demi permanent does a better job of darkening hair than semi permanent does, but it doesn't lighten hair. Demi permanent hair color will fade and typically lasts 12 to 24 shampoos.
Damage
If you're concerned about damage to your hair, it's best to avoid demi permanent color. While the damage it causes is minimal, it's still more of a risk than with semi permanent hair color. Because demi permanent color opens the cuticle up slightly, there is a chance hair will feel frizzy and dry afterward. Because semi permanent only coats the hair strand, any effects it has will wash out quickly.
Grey Coverage
Both semi and demi permanent dyes will cover grey, although demi permanent is much better at it. Semi permanent is acceptable for hair that has minimal grey in it or is just starting to lose color. It won't be a long-lasting solution, however. Demi permanent will color the grey better and for longer.
Caring for Semi and Demi Permanent Hair Color
Because both semi and demi permanent hair color fades quickly, it's important to take proper steps to ensure the color lasts as long as possible. Use moisturizing shampoos and conditioners, avoid shampooing every day if possible and cover your hair when going outside to shield it from the sun, which will accelerate the fading process. Also, tie hair back if possible when working out, doing chores or any other strenuous activity, as getting any excess sweat in your hair will cause the color to rinse out.
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