How Long Is Hair Color And Developer Good For?
Hair color and developer typically have a shelf life of about 1-2 years if they are unopened, but once they are opened and exposed to air, they may start to lose their effectiveness after about 6 months. It’s important to read the manufacturer’s instructions and use the product within the recommended timeframe to ensure the best results. If the product has been opened for a while or has an expired date, it’s best to avoid using it as it may not produce the desired results.