![]() ![]() However, these dyes may contain other alkalis similar to ammonia. Simply put, ammonia-free hair dye is a hair color that does not contain ammonia. Related: Vegetal Hair Dye – What Is It And Why To Use It? 6. As a result, you will need to constantly apply it to get the desired results. The color will easily fade off by shampooing. These dyes can melt off your previously dyed hair. If you plan on perming or straightening your hair, do not color your hair with these types of metallic dyes. However, it is still a good idea to do a patch test before using them. These metallic hair dyes do not contain PPD. When you apply gradual dye to your hair, it imparts a dark shade of the metal oxides or sulfides present in it. With each application, you’ll notice that the color gradually changes from gray to yellow-brown to burgundy. This hair dye needs constant re-application every few weeks. Gradual hair dyes are basically an aqueous solution of metals. ![]() That said, you will need to go for a touch-up every 4 to 6 weeks as the new hair grows. Red dyes are prone to fading and are the hardest to be kept vibrant. However, it can fade depending on your hair condition and exposure to UV and chlorine. The biggest advantage of using permanent hair dye is that it does not get washed off.
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