Real leather is made from animal hide, but its quality depends upon how it was processed, tanned, dyed, and finished. Vinyl, bonded, and faux leather are artificial.

Full Grain Leather：Full grain is the finest quality leather. As the name indicates, the hide and grain (skin texture) are fully intact (along with any scars or blemishes), which means only the ‘cleanest’ are used. Full-grain may be absorbent semi-aniline or aniline (referring to little or no clear finish), or it may have a more water-repellent, stain-resistant pigmented finish. Rub ‘n Restore® can be safely used on all these types of full grain leather.

Top Grain Leather：Top grain is the second best grade of leather. The outermost layer is sanded or buffed to minimize blemishes (like scars) and create a more uniform appearance. The finish may be a single solid color or have a printed, varied appearance to look like aniline, but top grain repels liquids and resists stains. Many top grain leathers have been split and the lower suede half removed. This makes a thinner, more flexible leather better suited to upholstery and luxury goods.

Aniline & Semi-Aniline Leather：These leathers are full or top grain. The dyeing process accentuates variations in the fiber, resulting in a marbled appearance. Aniline has no clear finish and a warm, velvety texture. Semi-aniline has a thin translucent finish and a slightly cooler, smoother feel. These leathers are prized for the natural patina that develops, but their absorbency also makes them prone to stains. They also sun fade and scuff easily. As such, cleaning doesn’t improve their appearance. A thin pigmented finish, however, can and will prevent new stains or fading, even though the leather will still be absorbent and soft. However, the warm velvety feel of unfinished aniline may slightly cool to a semi-aniline texture. We recommend diluting Rub ‘n Restore® Color with Clear Prep+Finish™ to make a glaze and use a mottling technique to mimic the original marbling.

Pull-up Leather：This full grain aniline leather has a pigmented waxed or oiled finish. This will repel our water-based acrylic finish, so the leather must be deglazed before Rub ’n Restore® can be applied. As with aniline leather, we recommend diluting Color with Clear Prep+Finish™ to make a glaze and using a mottling technique to maintain the natural variation and marbling.

Nubuck：This unfinished full grain leather has been brushed. This results in a subtle nap that affects its color and appearance (similar to carpet). Nubuck has a very warm and velvety feel but is absorbent and thus prone to sun fading and stains. Our products should be used with some caution, as they will finish (or coat) the material, slightly cool its texture, and may stiffen any worn or chafed areas. We recommend working with a glaze by diluting Rub ‘n Restore® Color with Clear Prep+Finish™ and using a mottling technique to mimic the original marbling.

Suede：Suede is the underside of full grain leather. Many suedes have been split and separated from the top grain and thus are only the lower, weaker half of the hide. Suede has a shaggy, almost furry texture and should never be finished. Imagine latex paint on carpet.

Corrected Grain or ‘Genuine’ Leather：This top grain leather has been further sanded to correct blemishes and scars and then finished and embossed with a different grain. It is non-absorbent. Beware, types of leather fabric advertised as genuine may actually be lower-quality corrected grain.

Split Leather：This refers to the lower, weaker half of the hide that has no skin surface or grain. Unfinished, it looks like thin suede and is absorbent. Others are embossed and finished, making them non-absorbent but still of inferior quality and strength.

Bicast / Bycast Leather：This is a split hide with an artificial grain embossed into a non-absorbent urethane or polyurethane coating. These coatings eventually lose their luster and become tacky or sticky. They can also delaminate, peel or flake, exposing the split suede beneath.

Leather Match：Leather upholstery is often paired with a matching synthetic on furniture and in auto interiors to reduce cost. The synthetic (usually vinyl but occasionally bonded or faux leather) is used on back and side panels where the body seldom touches. While the leather may discolor or fade, the vinyl or faux leather are often what crack, peel, or flake and require repair. Both the leather and matching vinyl are typically non-absorbent, except where worn or damaged.

Vinyl：This synthetic is made of water-repellent polyvinyl chloride (PVC). The backside of the material is a woven mesh or fuzzy polyester-cotton blend. It is used on boats and spa covers, as well as auto interiors and furniture. Naugahyde® was a trademarked name in the 1950s.

Bonded Leather：This is an inferior composite material notorious for peeling and flaking. Scrap leather is shredded, mixed with an adhesive, and rolled into a fabric which is then coated with a water-repellent polyurethane (PU) finish. This finish delaminates from the fabric. As such, repairs do not last and will not prevent further degradation. Click here to learn how you’d repair it and see the disappointing month-later result. DuraBlend® is a common brand trademarked by Ashley Furniture.

Vegan or Polyurethane Faux Leather：Faux is French for “false” and pronounced “fo”. Rayon or polyester fabric are coated with a water-repellent polyurethane coating. This coating develops hairline cracks that then peel or flake away like bonded leather, exposing the fabric. Repairs do not last because of the material’s instability. Here’s how you’d repair it, and why we don’t recommend it. Ultraleather® is a popular trademarked brand.

Faux Leather Fabric & Microfiber：Some polyurethane faux leathers (like LeatherAire® brand) wear more naturally but still degrade from a smooth, lustrous, non-absorbent material to a fuzzier absorbent microfiber, often lighter in color. All that can be done is to stain or paint the fabric and then wax it to create a leather-like appearance.

Tanning Methods
Most upholstery leathers and garments are chromium tanned, which lends to a softer, stretchier hide.

Vegetable tanned leathers are heavy and stiff and used to make saddles, belts, and luggage.

Aldehyde or brain tanned leathers are less common, especially in upholstery.

Dyeing & Finishing
After tanning, most leathers are dyed, commonly with aniline dyes. This is confusing, because aniline and semi-aniline can refer to both the type of dye used as well as the resulting finish.

Aniline dyes are water-based and accentuate the fiber’s natural variation. Aniline-dyed leather has no protective finish.

Semi-aniline dyes have added oils which result in a translucent finish.

Aniline and semi-aniline leathers may have little or no clear finish, are absorbent and thus prone to staining and fading. Others have a pigmented, water-repellant finish (like those used in auto interiors).

Learn more about the difference between leather dyes and finishes. If you need help, consult the pro.