Salaam, I’ve read that black hair dye is forbidden in Islam- those who do will not even smell the scent of paradise however i read that black mixed with another colour is fine, so does navy (a dark blue that looks black) suffice?
Yes, you read correctly that black hair dye is forbidden in Islam.
Now the question is -
- 'Is 1% less than pure black ok?' or
- 'Dark blue that looks black ok?' etc.
As per the intent of the law, one must avoid any color that appears black. Also, since the hadith is very strong with phrase 'they will not even smell the fragrance of Paradise', it is better to avoid anything that is close to black or looks like black.
This is my opinion.
Allah knows best!