How do you affix a scent to a sachet, mine last 2-3 days MAX.
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This site will give you a lot of ideas. Some I never even knew existed so we can learn together!!
https://www.pinterest.com/explore/drawer-fragrance-sachets/?lp=true
https://homesteady.com/how-5541564-make-fragrance-sachets.html
orris root is the traditional 'fixative' for perfumery (it's basically dried chopped root from a specific sort of Iris..)
Vetiver root also works for any sort of woodsy scents, though it's lovely on its own.