Raw hide, semi-processed leather and finished leather stay separate
FAO describes an extremely heterogeneous chain in which raw hides and skins trade from air-dried pelts through multiple intermediate stages to finished leather. ISO's leather committee separately covers raw hides and skins including pickled pelts, tanned hides and skins and finished leather. Atlas records animal species and category, origin, preservation, raw or pickled state, wet-blue, wet-white, crust or finished stage, split or grain layer and intended end use; one stage cannot be priced or specified as another.
Leather identity depends on structure, surface and tannage
ISO 15115 defines leather through animal origin, retained fibrous structure, tanning and the thickness of any surface layer. It separately defines full-grain, split, laminated, metal-free and organic-tanned forms. Atlas preserves species, full hide or skin and cut, full-grain, corrected-grain, nubuck, suede or split construction, tannage chemistry, finish and coating, thickness, area-measurement basis and colour rather than relying on an unqualified leather label.
Preservation, defects and chemical evidence remain with the lot
FAO says preservation should begin immediately after slaughter and identifies drying, salting, brining and other chemical treatment as common methods. Cuts, holes, contamination, decay, scars, parasite damage and poor curing can survive into later processing. For finished goods, destination rules may add chemical limits: EU REACH applies its 3-milligram-per-kilogram chromium VI threshold specifically to leather articles or leather parts coming into skin contact. Atlas records preservation, defect map and grade, laboratory method, sample and conditioning, chemical result, certificate, lot and date.
A terminology or chemical threshold does not establish a delivered leather price
ISO definitions and a destination-specific chromium VI restriction do not establish usable area, cutting yield, thickness tolerance, tensile or tear performance, colour consistency, finish adhesion, current availability, transaction value, freight or destination cost for a lot. A delivered comparison still needs permitted current observations for the exact species, processing stage, construction and grade, test evidence, measured area or weight, package, origin, quantity, currency, Incoterm, destination, delivery window, route costs and information vintage. Atlas withholds a physical estimate when those observations or usage rights are missing.