Hierarchy classification:

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

Narrower term/s

• alpha-lipoic acid [NP]

Anotations

Scope note:

Organic chemical compounds capable of forming coordinate bonds with metals. Chelating agents are used to sequester or remove residual trace metal ions from materials to which they have attached. In a conservation context, uses of chelants include stabilizing of paper containing iron-gall ink, removal of iron residue from platinum prints; treatment of excavated copper objects.