* True Permanent Hair Color: This type of color alters the hair's structure to deposit color molecules within the hair shaft. It requires a developer (usually hydrogen peroxide) and lasts until the hair grows out or is cut.
* Color Sprays: These typically deposit color on the surface of the hair shaft. They're designed to be temporary and wash out with shampoo.
Why a Truly Permanent Color Spray Isn't Feasible:
* Application: Permanent hair color needs to thoroughly saturate the hair and remain in contact for a specific amount of time to effectively penetrate the hair shaft. A spray application, especially with a fine mist, would likely not provide enough saturation for consistent, lasting color.
* Chemical Reactions: The chemical processes involved in permanent coloring (opening the hair cuticle, depositing pigment, and sealing the cuticle) require a specific formulation and application method that a spray cannot easily deliver.
* Coverage: Achieving even and complete coverage with a spray, particularly on thicker or darker hair, would be very challenging.
Alternatives and What's Available:
1. Temporary Color Sprays: These are widely available and come in various colors. They're great for special occasions, experimenting with color, or adding a quick touch-up. However, they wash out with shampoo.
2. Semi-Permanent Hair Color: This type lasts longer than temporary sprays (typically several washes) but gradually fades. It doesn't penetrate the hair shaft as deeply as permanent color.
3. Root Touch-Up Sprays or Powders: These are designed to conceal gray roots or blend in regrowth between salon visits. They provide temporary coverage and wash out with shampoo.
In summary, while a truly "permanent color spray" doesn't exist, you can use temporary color sprays for quick color changes or opt for semi-permanent or permanent hair dye for longer-lasting results.