Menthol Crystals Natural Cooling Antiseptic Decongestant. Known as Mentha Arvensis it is presented by us for sale as shards of Menthol Crystal. Sourced from India. Many uses including aerial disinfection of work & living spaces. Anti-bacterial & decongestant. A superb cooling, minty & refreshing experience can be created by burning the Menthol on charcoal blocks (also sold in our shop) or by placing some into hot water for a more subtle aroma Crystals are often placed in a material bag & then put in wardrobes/draws to discourage pests. For Bee keepers to eliminate disease in Honey bees.