aniline
Leather dyed with transparent dyes that penetrate the hide. The natural grain remains visible. The most premium finish — and the most vulnerable to water and staining.
calf
Leather from a young bovine. Finer, thinner, and more uniform than mature cowhide.
e.g. “Italian Fine Grain cowhide leather”
chrome tanning
Tanning using chromium salts. Modern, fast, produces soft and water-resistant leather. ~80–90% of global leather production.
chrome-free
Tanning using synthetic tannins without chromium. Increasingly common at certified tanneries.
color transfer
When dye from one material (often denim) transfers permanently to a porous-finished leather.
conditioning
Applying a leather-specific conditioner to replace oils. Often over-applied; high-quality finished leather rarely needs more than annual treatment.
corrected grain
Grain layer that has been heavily sanded and then coated with a thick pigment to produce a uniform surface. Less premium than full-grain.
cowhide
Leather from mature bovine. Stronger and thicker than calf.
edge paint
The finish applied to cut edges of leather panels. Quality of edge paint is one of the clearest visible indicators of bag construction quality.
embossing
Heat-and-pressure imprinting of a pattern (pebbled, Saffiano, croc) onto the leather surface. Can be applied to any grade.
finishing
The post-tanning treatments — dyeing, coating, embossing — that determine how the leather looks and behaves.
full-grain
Leather using the outermost grain layer with its natural surface intact. The most durable grade.
genuine leather
A regulatory term meaning real leather, but in practice often used for the lowest disclosed grade — frequently coated split.
grain
The outermost layer of a hide, with the densest fiber structure and natural surface marks.
hardware
Metal components on a bag — buckles, D-rings, zip pulls, magnetic closures.
hide
The raw animal skin before tanning.
lining
The interior material of a bag. Can be leather, cotton twill, suede, or a coated synthetic ("bonded lining").
LWG
Leather Working Group — a certification audit covering tannery environmental practices, traceability, and chemistry.
nubuck
The outer grain surface of leather buffed to a soft velvet nap. More durable than suede.
patina
The natural surface change in leather over years of use. Most visible on vegetable-tanned full-grain.
pebbled grain
A textured surface, either natural or embossed, with a small uniform pattern resembling pebbles.
pigmented
Leather with an opaque colored top coat. Uniform and durable, but the natural grain is no longer visible.
Saffiano
A cross-hatch embossed texture, originally a Prada finish, now produced by many tanneries.
semi-aniline
Aniline-dyed leather with a thin protective top coat. The natural grain remains visible but the surface is more stain-resistant.
split
The lower layer of a hide, separated during processing. Softer and weaker than the grain layer. Often heavily coated for use in cheaper goods.
stitching
The thread-and-needle work joining leather panels. Quality of stitching is a primary durability factor.
stress point
Where a handle or strap attaches to a bag. Where reinforcement matters most.
suede
The inside of a split leather buffed to a velvety nap. Softer than nubuck, less durable.
tannery
The facility where hide becomes leather. The tannery country is what most "Italian/Spanish leather" claims refer to.
tanning
The chemical process that stabilizes hide protein and produces leather.
top-grain
Leather with the outermost surface lightly sanded to remove imperfections, often re-embossed with an artificial grain.
vegetable tanning
Tanning using plant-derived tannins. Produces firmer leather that develops a deep patina over time.