tars
preferred label: قطران @fa
type: Concept
related: pitch

pitch
related: tars
related: resins
broader: materials by form
preferred label: قطران گیاهی @fa
type: Concept

resins
preferred label: رزین‌ها @fa
type: Concept
related: pitch

materials by form
preferred label: شکل مواد @fa
type: Concept
narrower: pitch