* Desired outcome: If the goal is to achieve a rich, dark black color, it is likely achievable.
* Hair condition: It is important to consider the health of the hair before any dyeing process.
* Strand Test: It is best to do a strand test before dying the entire head of hair. This will allow you to see how the hair dye reacts to your hair and whether you are satisfied with the result.
* Professional opinion: If you are unsure about what to do, it is always best to consult with a professional hair stylist.