@Kamalraj M Thanks for your reply sir. But can you please suggest the essential oil to mask the smell of tea tree oil since few customers didn't like that smell. As fragrance oil is not natural, I would like to go with essential oil to make the soap fully natural. I am using 3% tea tree oil, so how much I can use the other?
The most widely used and beat suited fragrance option for charcoal is the musk fragrance. You can also try the vertiver fragrance for it