Hierarchy classification:

1. top of the aat hierarchies
2. Materials Facet
3. Materials (hierarchy name)
4. materials (substances)
5. [materials by function]
6. additive (material)

Anotations

Scope note:

Any hygroscopic additive used to promote moisture retention. Humectants are added to commercial products such as cosmetics, tobacco, baked goods, and to leather to restore suppleness. Glycerine is an example of a humectant.