Deciding how long to wait to redye your hair depends on several factors. If you apply more hair dye too soon, it could cause severe damage to the hair follicles, leaving your hair dry and brittle. Dyeing your hair again too soon can also cause you to choose the wrong colour to reapply, as the condition of your hair may cause it to absorb more or less of the colour.
First you need to think about why you want to redye your hair already. Is the colour wrong? If it is too dark, try washing your hair several more times to see whether it will lighten up. Maybe the change in your appearance just takes some getting used to. Give it a couple of days before you make any decisions regarding redyeing your hair.
Before you actually decide to redye your hair, look at the overall condition of the hair. If the hair appears dry and brittle with a lot of split ends, consider conditioning it before applying any more chemicals. More chemicals now will only worsen the damage. Soak your hair in a quality hot oil treatment or a quality conditioner before you do anything.
If your hair has been dyed by a professional salon and looks to be in good condition, you can redye it after a couple of weeks. It would be best to return to the same salon, considering the fact that your first results were good. The quality of dyes, shampoos and conditioners used in salons are usually better than what we use at home.
If you have dyed your hair at home with good results, be sure to use the same brand of dye that you used the first time. Always stick with something you are pleased with. Cheaper hair dyes may be harsher on your hair and will result in damage that may require a professional's help to repair.
Wait as long as possible between hair colourings. The longer you wait, the less your hair and skin is exposed to harsh chemicals. You should never redye your hair if the first colouring resulted in burning skin or any rashes in the scalp. This could be an allergic reaction to something in the dye. Check with a professional stylist.
If you are at all unsure about dyeing your hair at home, you should have it done in a salon by someone who is used to working with hair dye. Using the wrong dye, or not applying it correctly, could leave your hair looking much worse than you think it did originally.
Hair dye is a chemical, and you should always handle it safely. Avoid getting the solution in your eyes, and make sure you are in a well-ventilated area when you apply it to your hair. The dye will stain clothing and anything else it spills on as easily as it dyes your hair.
Once the dye has been applied to your hair and thoroughly rinsed out, follow up by using a quality shampoo and conditioner that are made for dyed hair. This will ensure that your hair remains in the best condition possible.