Hierarchy classification:

1. top of the aat hierarchies
2. Materials Facet
3. Materials (hierarchy name)
4. materials (substances)
5. [materials by form]
6. [materials by physical form]
7. colloid (particulate material)
8. gel

Anotations

Scope note:

Refers to gels, such as Carbopol (TM), used in conservation as a non-invasive alternative to aqueous cleaning for paintings and other media, including wood and stone. Solvent gel poultices have also proven effective in removing adhesive tape from paper.