Fun hair care fact: blonde hair color doesn’t actually fade, unlike brunette and red shades that require frequent touch-ups to maintain their hue. Reply Was this helpful? Hair dye doesn’t usually have the greatest of smells, but it shouldn’t smell excessively foul or metallic. Semi-permanent hair dyes as their name suggests offer semi-permanent results, which last several washes (usually 4-12 washes). If your intended hair color is not red, yellow, or orange, this coloring can indicate that the chemicals inside have gone bad and are no longer useable. Because of this, you can simply do your retouch service at the usual time (5-8 weeks) and then bring the color through the hair at the end of the processing for the retouch in order to refresh the color. This is due to the belief that if the package is correctly stored, it has an almost unlimited shelf-life. If your hair grows fast you may have to at least touch up the roots before the 6 months. The variance in the length of time between retouches is largely dependent on the rate at which your hair grows. If the dye is in a hard box container, it can appear dented, indicating that the materials inside might be compromised. Let’s be honest, if you buy the cheapest hair dye, you will have to re-dye your hair sooner than if you are to purchase a good quality hair dye. You can also smell the dye by wafting the container under your nose (you don’t want to inhale too much of the scent). IMPORTANT! Henna is a permanent hair dye. The container has a chance of exploding as well. That being said according to many of our happy customers our colors last too long, at least a month if not two months using sulfate-free shampoo and conditioner with cool water. Darker colours tend to keep longer than lighter colours. We get it, the days are all blurring together at this point. The 10 Best Lip Stains in 2021 - Guide to Lip Stain Types. Even though it is semi-permanent you will still want to treat it like it is permanent as to get the full 6 weeks out of the hair dye. Proper storage in this case refers to the climate the dye is kept in. How long you can keep it and get satisfactory results, varies. Mix it according to instructions and observe the color. It is also not healthy for your hair if you are dying it all the time. When dying your hair and how long it last depends on how healthy your hair is. Again, the permanent dye will last as long as you maintain your colored hair. One minute you’re spring cleaning happily, and the next, you’re unearthing box after box of forgotten hair dye. For most brands, the hair color product will go bad a few years after the manufacturing date. For instance, keeping the dye in direct sunlight or another warm area can spark unwanted chemical reactions. If even after that, the tone isn’t as vibrant as you want, you can bleach your hair again, but use a 10-volume peroxide. 2. If you continue to use this site we will assume that you are happy with it. Henna hair dye 8-16 weeks Demi-permanent hair color 5-12 weeks.Example of demi-permanent hair color is Pravana Temporary hair dye 1 day Kool-aid hair dye 2-4 weeks Allergic reaction to hair dye Symptoms of hypersensitivity to hair dye may last anywhere from a few days to a week or more, depending on the severity of the reaction. Typically, expired hair dye will turn your hair bright green, but there is the possibility of turning your hair any number of undesirable colors. The more severe outcomes of using expired dye include damaging your hair so badly it frizzes and/or breaks off. You are able to store an unopened hair color or highlights bottle for up to six months after it's made. Storing/keeping opened (but unmixed) hair dye. You want to make sure it is the color you were hoping for before you ruin your whole head and having to go to a professional to get your hair fixed. It seems a shame to throw it all away, especially when you’d love a style change to go along with that cleaning. Semi-permanent hair dye is exactly what is means, semi-permanent. Then, slowly tilt the bottle as if to pour it. With proper storage, the general consensus is that opened hair dye can last from 1-2 years, while a sealed box can last up to 3 years or possibly longer. Depending on the type of dye used, and your hair’s condition and colour, a semi-permanent hair dye can last anywhere from 6-8 weeks, or on average 28 washes. Let me explain the difference between the 2 types of hair color first so that you can totally understand what I'm talking about. Semi permanent color can and does last as long as permanent hair color, usually. The date of manufacture is indicated on the box, if it is a box hair dye. 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