I am looking to create different scented wooden boxes for a business idea I have in mind. However, not having any experience in scented objects I wanted to know what would be the best way to go about this. The box I have measures 14 x 9cm x 4cm and is made of pinewood. My initial plan is to add the scent to synthetic wool, wait for it to completely dry and then insert this into the wooden box and seal it shut. However, I don't know how well this will work or the required amount of scent to achieve this. I don't want to spend a lot of money on fragrances I may or may not need.
To conclude, Would like to know if anyone knows how much ml of fragrance would be appropriate to use on the fibre for each box and what would be the most effective and long-lasting method of keeping the scent. I am happy for a scent that lasts for more then a week and have contemplated adding holes in the box to achieve this.
Secondly, what would be the cheapest way to achieve this for different scents. Should I purchase the scents or attempt to make them myself?
If anyone has come across doing something similar and has their own idea of what works best would appreciate very much.
I've attached a picture of the scented fibre In the box. 
