The Goal:
* Deposit only: You want to deposit the black pigment without significantly lifting the red. Lifting can expose underlying warm tones, leading to unwanted brassiness or muddy browns.
Recommended Developer:
* 10 Volume Developer: This is generally the best and safest choice for going from red to black.
* Why: It deposits color effectively with minimal lift. This is exactly what you want to avoid unwanted warmth coming through.
* Use: Follow the hair dye manufacturer's instructions for the specific dye you're using. The mixing ratio is usually 1:1 (dye to developer).
Why NOT Higher Volumes:
* 20 Volume Developer: This *can* be used in some cases, but with caution.
* Risk: 20 volume provides a slight lift, which *could* be helpful if your red is very vibrant and you need a bit of a boost in coverage. However, it also increases the risk of pulling out underlying warm tones, resulting in a less-than-perfect black.
* Only consider if: Your hair is naturally very dark and resistant to color, and the red is intensely pigmented. If in doubt, stick with 10 volume.
* 30 or 40 Volume Developer: Absolutely avoid these. They are far too strong and will significantly lift your hair, exposing a lot of orange and red tones, leading to a very uneven and unwanted result.
Key Considerations & Best Practices:
* Fill with Red/Brown Pigment (Recommended for Best Results): Before applying the black dye, consider *filling* your hair with a demi-permanent red-brown shade. This is crucial for long-lasting color and preventing the black from fading to a reddish or muddy tone later.
* How: Choose a demi-permanent dye in a shade like auburn or a deep red-brown (depending on the intensity of your red). Use a 10 volume developer with this filler. Apply it evenly and process according to the filler dye's instructions. Rinse and dry your hair completely before proceeding to the black dye.
* Why: Black dye is essentially a blend of blues, violets, and greens. When applied to red hair, the red tones can neutralize or overpower the cool tones in the black, leading to fading and a less-than-true black color. Filling replenishes the base and ensures the black sits correctly.
* Choose a High-Quality Dye: Opt for a professional-grade dye or a well-regarded drugstore brand known for its pigmentation. This will give you better coverage and longevity. Avoid dyes that are known for fading quickly.
* Strand Test: ALWAYS do a strand test! Apply the dye mixture to a small, hidden section of your hair to see how it takes the color. This is essential to prevent surprises.
* Multiple Applications (If Necessary): If the first application doesn't fully cover the red, you may need a second application of the black dye a few weeks later.
* Protein Treatment: After dyeing and rinsing, use a protein hair treatment to rebuild strength and elasticity. This helps reduce breakage or damage when your hair changes shade.
* Maintenance: Use color-safe shampoo and conditioner specifically designed for dark hair. Avoid clarifying shampoos, as they can strip the color.
* Consult a Professional: If you're unsure about any of these steps or if your hair is damaged, it's always best to consult a professional hairstylist. They can assess your hair's condition and recommend the best approach to achieve your desired results safely.
In summary:
* 10 Volume Developer: Your safest and generally best choice.
* Filling with a Red/Brown: Highly recommended to prevent fading and achieve a true black.
* Strand Test: Mandatory!
* Quality Dye: Invest in a good product.
Good luck!