Mixed hair dye does not last. Once hair dye is mixed with a developer, it is activated and should be used immediately. You should discard any unused mixture.
Why Mixed Hair Dye Doesn't Last
When you combine hair dye with a developer, a chemical reaction starts. This reaction activates the dye, allowing it to penetrate the hair shaft. Once activated, the mixture is unstable and its coloring ability deteriorates quickly.
- Activated Ingredients: The developer's chemicals begin to oxidize the dye, and once this process starts, it cannot be stopped or reversed.
- Loss of Effectiveness: Over time, the activated dye will lose its potency and will not color your hair properly.
- Unpredictable Results: Attempting to use leftover mixed dye can lead to unpredictable color results, potentially causing uneven coloring or an undesirable shade.
- Safety: Also, the chemical reaction can continue, potentially producing irritating by-products.
Reference Information:
The reference states: "Mix and use immediately! Discard any unused hair color mixture. This means, DO NOT put it in the fridge, under your sink for next month. If the color is mixed with the developer, it is activated and WILL NOT last until next month."
Safe Handling of Mixed Hair Dye
Given the nature of activated hair dye, proper handling is crucial.
- Always mix only what you need: Estimate the amount of dye required to avoid having leftovers.
- Never store mixed dye: Discard any remaining mixture immediately after use.
- Do not store in any environment: Whether in the refrigerator or another location, storing mixed hair dye is not recommended because the activated chemicals break down and the color will not work.
| Aspect | Recommendation |
|---|---|
| Mixing | Mix only what you need |
| Storage | Do not store; discard after use |
| Time | Use immediately |
By following these guidelines, you can ensure safe and effective hair coloring.
