Important Considerations:
* Porousness of Blond Hair: Blond hair, especially if it's bleached or heavily processed, is often more porous than darker hair. This means it can absorb color quickly and unevenly. It can also sometimes grab the color and become *ashy* or *green*.
* Filler: Due to the porous nature, it is usually necessary to fill the hair with red and orange tones. This is because when coloring hair dark, the process strips the hair of its natural tone, resulting in the need to replace the lost tones. If you fail to replace these tones, the hair will turn green.
* Green Tones: If you apply a dark brown dye directly to blonde hair, it can result in a green tone. This is because the absence of red and orange undertones in the blonde hair reacts with the blue tones in the brown dye.
* Fading: Dark brown color rinses can fade more quickly on blond hair, especially if it's porous.
* Damage: If you are unsure of how damaged your hair is, and how well it will react to dye, then consult a professional stylist to test out an area on your hair. This will let you know how your hair will react to dye, and if the color can be achieved without further damage.
* Maintenance: You will likely need to maintain the color with regular glosses or color-depositing conditioners to keep it looking rich and prevent fading.
In Summary:
Color rinsing blonde hair dark brown is possible, but it requires careful planning and execution. Preparing the hair with appropriate filling of orange and red tones, following the recommended process, and proper maintenance will help you achieve a beautiful and long-lasting dark brown color. If you're unsure about any part of the process, it's always best to consult a professional stylist.