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Thread: Identifying type of leather?

  1. #1
    Join Date
    Feb 2012

    Default Identifying type of leather?

    Hi Roger,

    I recently purchased a used leather chair and not even sure what type of leather it is. It has what appears to be a set oil stain and I am trying to figure out the best product to use to remove the stain, if possible. Below is a picture of the chair...would you be able to help me?
    Thank you,

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  2. #2
    Join Date
    Feb 2007
    Greater Vancouver, Canada.


    >>> I recently purchased a used leather chair and not even sure what type of leather it is.
    Leather finishes is identified as “Aniline Sauvage”.

    >>> It has what appears to be a set oil stain
    From its position, most likely from body oil, grease and sweat and could also be possible from hair products.

    >>> and I am trying to figure out the best product to use to remove the stain, if possible.
    Body oil, grease and sweat will need a Degreaser-2.2 > Acidifier-2.0 > Hydrator-3.3 system. Prolong or aged sweat will cause the denaturing of the leather and color transfer to a cotton towel is one sign of color running due to alkalinity overexposure. Acidifier-2.0 long dwelling under Towel-5 will help to pH balance to the leather pH neutral (isoelectric point or pI) for leather chemistry pH integrity. To rectify color lost due to leather denaturing from sweat or alkaline cleaner or sun fading, the dormant excess dyestuff within the leather structure may be activated to resurface with a long dwelling with Hydrator-3.3 up to 72hours or repeat until inspection for appearance satisfaction.

    Unnatural creases and wrinkles is a sign of leather dryness of its fatliquor (fat and oil) moisture content, and rejuvenating after color appearance satisfaction may be further improved with Fatliquor-5.0 both amplifying the color saturation and suppleness.

    Further appearance by color refinishing is an option to bring it back to showroom condition - remember that this leather is already second-hand when first ‘new’, first used by the ‘cow’ - then ‘new’ by man.

    Further readings:
    Aniline leather is soft and natural. They are usually first treated with transparent dyestuff to make the grain and natural characteristics more visible. Modern tannery dyeing is done in a rotating drum in a continuous process follows with fatliquoring. When dried thereafter, the leather goes through another selection or grading to decide the best treatment to bring out their potential softness and natural look. Thus, further sub-divide into various varieties. However, the bulk of aniline leathers after dyeing may reveal uneven grain dye absorbency and too many faults, so that the variation in color over the entire grain surface is too great for many leather fabrications.
    Varieties of aniline leathers may be referred to as “full sauvage aniline” with differing intensity of dye absorbency appearance.
    Use this Aniline (A.fs) Full Sauvage as reference guide when comes to cleaning and restoration. Identify the problem from the left column and the top row the product recommended and the numbers is the sequence of steps. When leather have compound issue combine the soiling, stain and odor types as the cleaning phase-1 and the leather rejuvenating with Hydrator-3.3 > Fatliquor-5.0 as the second phase-2. Structural problem as third phase-3, Finishing as phase-4 and protection of the finishes as phase-5.

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    Aniline (A.fs) Full Sauvage

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    Leather Doctor® Kit, aniline leather topcoat refinishing kit is designed for topcoat repairs from friction wear, accidental scratch, scuff and abrasion to deteriorating greasy sweat stains. These topcoat damages are identified as white, dull or darkening stain from bare body contacts. Accidental whitish damages in most cases are free of soiling and direct AnilineTop-21G application with in between dry sanding rectifies most damages. Repairs to topcoat from daily wears that dulls will require a degreasing to remove penetrated rub-in soiling prior to topcoat application in a sequence process including Degreaser-2.2 follows with Rinse-3.0; Hydrator-3.3 follows with Fatliquor-5.0 prior to topcoat application. In a greasy and sweaty topcoat damaged areas especially to the headrest and armrest, a deep degreasing is essential follows with Acidifier-2.0 to stabilize the hydrogen bonding between the protein fibers with the other leather constituent like the tanning agent, dyestuff and fatliquor. This deep degreasing process is assisted by leather Eraser-4 in both the wet and dry cleaning process to remove soiling particulates off the leather surface. Hydrator-3.3 helps in the colloidal water movement bringing suspended soiling particulates to resurface through a dwelling and wicking process. Fat and oil is replenished by Fatliquor-5.0 in an emulsion form to penetrate into the leather structure. Once the fat and oil is hydrogen bond with the protein fiber, the water content breaks free leaving a breathing space for natural transpiration. The fat plumps the leather with fullness preventing the leather structure from collapsing during compressing and flexing while the oil lubricates the fiber from sliding smoothly over one another like millions of connecting hinges. Protector-B impart a non-stick, rub-resistant surface with a buttery feel helps reduce friction wear to the topcoat and extended a high level of appearance for a longer period of time. When the leather is contaminated with foreign soiling, it is essential to look at topcoat refinishing in a holistic approach. Note that the cleaning and rejuvenating products suffix denotes its pH value in this leather-safe aniline leathers topcoat refinishing system.

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    Leather Doctor® - aniline leather dye refinishing kit is designed for dyestuff and topcoat refinishing from the simple sunlight fading to the severely sweat damages from body oil and grease. Most severely penetrated, prolonged and neglected stains show a darkening effect with a sticky feel have its topcoat and dyestuff probably deteriorated by the sweat. When the stain feels sticky, it is a sign of leather denaturing and reverting to rawhide from breaking of bonds with the tanning agent. When sign of color is transfer to a white towel, it indicates that the dyestuff has also break bonds with the protein fiber. When leather is stiff or shows signs of whitish residue migrating, it shows that the fatliquor is breaking bonds as well with the protein fiber. The main component of the leather protein fiber is amphoteric while the other constituents are not; shifting of the pH mainly caused from sweat to alkalinity affects the pH imbalance. To revert from denaturing into rawhide prior to topcoat refinishing, contaminated alkaline soiling is removed with Degreaser-2.2, a waterbased (pH 2.2) multifunctional degreaser that emulsifies greasy contamination besides controlling dye bleeding and charging the protein fiber ionic positive for strengthening the attraction between the ionic negative tanning agent, dyestuff and fatliquor. Deflocculated and suspended soiling is towel extracted, thereafter rinse and pH balanced with Acidifier-2.0 to prevent the leather from reverting to rawhide. When leather feels sticky or slimy it is a sign of leather denaturing, a squeaky feel when wet is a sign of a healthy leather. Hydrator-3.3 relaxes stiff leathers and removes surface tension free from surface blotchiness prior to fat and oil replenishing. Fat and oil is replenished with Fatliquor-5.0 to rejuvenate the leather for the desired suppleness when dry. Custom redyeing commences prior to topcoat refinishing. Protector-B imparts a non-stick rub-resistant protection with a buttery-feel that shield against sticky soiling and reduce friction noises. Protector-B+ is the classic leather scented version. Note that the mentioned product suffix number denotes its pH value in this holistic leather-safe aniline leathers dyestuff and topcoat refinishing system.

    Roger Koh
    Leather Care System Formulator
    Consultant / Practitioner / Instructor

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