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Thread: Nubuck leather by GAMMA (Italy) – stains collection from recent to 7 years old

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  1. #1
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    Default Nubuck leather by GAMMA (Italy) – stains collection from recent to 7 years old

    The large geographic stain on the seat is from one of my kids who slept on it and had an accident (peed) on it. The other stains on the seat are from water/liquid - eating in the area.

    The dripping stains on the back and arm rests - We have a special need child that we thought was dripping pancake syrup on it when we saw the first couple of them. Over the years we found out that he goes downstairs at night, get naked and hump the chairs.

    The stain are from recent to 7 years old

    Obviously I like the wrong type of finish for my family situation.

    My intentions are to try and get the stains off, change the color to disguise them (if necessary), and protect the surface better. I would also consider converting the finish.

    Thank you very much.
    KOA

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    #2 - back of sofa, dripping stain from special need child humping chair
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    #3 - Tried to clean b4 doing my research
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    #4 - kid pee (large stain) body oil, food and drink stains on sofa seat
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    #5 - body oil, food and drink stains on seat
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  2. #2
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    Pictures shows this nubuck comes with leather trim of aniline type.

    The below problem solving guides will therefore be used accordingly.

    1 Nubuck (N) Leather Problem Solving Guide

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    Nubuck is top-grain cattle leather that has been sanded or buffed on the grain side, or outside, to create a velvet like texture or nap. It has the characteristic of a slight nap, with the softest “hand” or tactile feel. Although nubuck is aniline dyed through and sanded it is commonly finish with a surface dye sometimes incorporating micro-pigment to cover up some natural blemishes. It looks similar to suede, but the difference is that suede is created from the flesh side of leather, whereas nubuck is created from the grain side of leather. As both nubuck and suede are napped leather, it is often incorrectly identified as suede. Leather is both hydrophilic and oleophilic, nubuck especially with its open nap absorbs both water and oil more readily, than any other smooth leather. It is generally more expensive than suede; fashion types include embossed, oil and wax pull-up effect. Fatliquor plays an important role when comes to maintenance to both reduce ingress of waterbased and grease stain; plumps the leather with fullness, reduces creases, and wrinkles. Leather protein-fiber component is amphoteric therefore, a leather-safe (pH 3 - 5) care product system is highly recommended to keep them clean while maintaining their chemistry integrity.




    2 Aniline (A) Leather Problem Solving Guide

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    Last edited by Roger Koh; 03-17-2014 at 09:50 AM.

  3. #3
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    >>> The large geographic stain on the seat is from one of my kids who slept on it and had an accident (peed) on it.

    It would be good to have a more detailed close-up pictures for a closer inspection and how old is the stain?

    Recommended kit for the urine stain is this Kit N5.uk for Nubuck.

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    Leather Doctor Kit N5.uk – Nubuck Urine Killer Kit
    Leather Doctor® Kit N5.uk, nubuck leather urine killer kit is designed to decontaminate urine problems. Aged urine is detectable with its characteristic ammonic odor. The presence of ammonic odor may indicate the shifting of pH value up to 10. The leather will most likely feel sticky or slimy with wet finger testing it. This stickiness is a sign of leather denaturing and reverting to rawhide. pH balance to stabilize the denaturing leather is rectify with Acidifier-2.0 prior to cleaning the protein residue with d’Protein-10. Rinse-3.0 may follow prior to treatment with d’Urine-2.1. At this stage, the leather should feel squeaky after returning to its chemistry integrity of pH 3 - 5. Stiff leather is relaxed and sticks together fiber separated by Hydrator-3.3. The penetrated stain removing process continues with hydrating prior to fat and oil replenishing with leather scented Fatliquor LS-5.5. The surface wear of the leather is greatly reduced with a rub-resistant Protector-S+ that enhances a non-stick draggy-feel to shield against sticky soiling. Note that the mentioned products suffix numbers denotes its pH value in this holistic approach for nubuck leathers urine decontamination process.

  4. #4
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    >>> The other stains on the seat are from water/liquid - eating in the area.

    Most liquid from drinks would contain tannin, the coloring derive from plants and vegetation and would require a specialty tannin stain remover such as d’Tannin-3.5 from this Kit N5.ns as an add-on to the main Kit N5.uk.

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    Leather Doctor Kit N5.ns – Nubuck Tannin Remover Kit
    Leather Doctor® Kit N5.ns, nubuck leather tannin stain removal kit is designed to remove cellulose stains such as coffee, tea, wine and other stains that derive from plants and vegetations will probably be removed with d’Tannin-3.5. It is a waterbased leather-safe tannin stain remover. Surface residue is removed with Cleaner-3.8 follows by Rinse-3.0 and let dry prior to d’Tannin-3.5 treatment. As most stains become penetrated, an inter-fibrillary colloidal water movement is further facilitated with Hydrator-3.3 to move suspended stains to resurface prior to fat and oil replenishing. Fatliquor-5.0 imparts leather with softness and strength when dry. The surface wear of the leather is greatly reduced with a rub-resistant Protector-S+ that enhances a non-stick silky-feel to shield against sticky soiling. Note that the mentioned products suffix numbers denotes its pH value in this holistic approach to removing vegetables and plants derived stains from nubuck leathers.

  5. #5
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    >>> The dripping stains on the back and arm rest - We have a special need child that we thought was dripping pancake syrup on it when we saw the first couple of them. Over the years we found out that he goes downstairs at night, get naked and hump the chairs.

    All protein related stains has a tendency to coagulates and stiffen the nap will require removing them with d’Protein-10 > Acidifier-2.0 system. A coarser suede eraser than the leather eraser helps with better traction to remove excess deposit. Refills for these two products are available from the on-line store.


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    Leather DoctorKit N5.ps – Nubuck Protein Remover Kit
    Leather Doctor® Kit N5.ps, nubuck leather protein stain removal kit is designed to remove protein based stains that tends to coagulates. d’Protein-10 is designed to deflocculates coagulating protein stains such as blood, body-discharge, milk, cream, ice cream, egg, meat juices, vomit, perspiration, urine and other protein based stains. Moreover, any staining that comes from a living animal or person will probably need this product in the removing process. Acidifier-2.0 is a leather pH stabilizer that is used to rinse and neutralize to its desired neutral pH of 3 - 5 simultaneously and ensures that the leather retain its healthy squeaky feel with a wet finger testing. Hydrator-3.3 relaxes stiff leather and reduces surface tension prior to fat and oil replenishing. Fatliquor-5.0 replenishing rejuvenates the leather structure for softness and suppleness when dry. The surface wear of the leather is greatly reduced with a rub-resistant Protector-S+ that enhances a non-stick silky-feel to shield against sticky soiling. Note that the mentioned products suffix numbers denotes its pH value in this holistic approach to removing protein based stains from nubuck leathers.


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    Suede Eraser-5
    This is a 2½ x 2 x ¾ inch fine pumice block with corrugated side for effective nap exfoliation

  6. #6
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    >>> My intentions are to try and get the stains off, change the color to disguise them (if necessary), and protect the surface better. I would also consider converting the finish.

    Stains are considered foreign contamination and have to be removed as much as possible, leather rejuvenated prior to color to disguise or camouflage them. Protection is comes in three levels, the saturating of the leather structure with fatliquor impedes ingress of liquid stain to a degree. Dyestuff is protected with a dye fix from crocking or bleeding and a non-stick rub-resistant protector keeps the surface for easy cleaning. Converting the finishes would be an option, in my opinion I would rather retain as nubuck for more seating comfort with class. To camouflage any remnants stains the darkest present would be the lightest choice of color to hide them and the leather should return to its “finger writing effect” with softness and strength.

    Degreaser-2.2, Nubuck-28 and Dyefix-99 would be addition for a camouflaging color refinishing to the Kit N5.uk.

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    Leather Doctor Kit N7.cl – Nubuck Dye Refinishing Kit
    Leather Doctor® Kit N7.cl, nubuck dye refinishing kit is designed for dye refinishing after degreasing in a holistic approach. Most severely penetrated, prolonged and neglected stains from the bare head and hands that show a darkening effect with a sticky feel have its dyestuff probably deteriorated by the oil, grease and 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 dye 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 caused from sweat to alkalinity affects the pH imbalance. To revert from denaturing into rawhide prior to dye 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 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. Protector-S+ enhances a non-stick silky-feel to shield against sticky soiling. Note that the mentioned product suffix number denotes its pH value in this holistic leather-safe nubuck dye refinishing system.
    Last edited by Roger Koh; 03-17-2014 at 08:43 PM.

  7. #7
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    The urine stain has been on for about 4 years; the dripping stains <1 to 7 years; the food and drink stains <1 to 5 years. To think about it, I also applied protection cream about 4 years ago (with minimal knowledge of types of leather).

    #1 - dripping stain
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    #4 - Food and drink stain
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    #5 - Urine stain
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  8. #8
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    http://www.leathercleaningrestoratio...-from-dog-peed

    The system approach for dried urine stains are the same, however have to take note that the leather type and finishes may differ so tools used have to match the finishes. Use the Nubuck (N) Leather Problem Solving Guide posted above as reference. Urine under the heading of “Stain Type” is solved by the system step 1 to 7 from left to right. Steps 1 to 5 is the cleaning phase and remains until the result proves satisfactory before moving into leather rejuvenating it as the second phase with step 5 and 6. When dry it is finished with step 7.

    Now we start with the cleaning Post #7 picture #5 as follows:

    #1. Dry soil removal utilizes tools Eraser-4, Eraser-5 nubuck Brush-2 and a vacuum cleaner to remove surface soiling.
    #2. The stain area nap may have been chemically deteriorated or damaged from the urea content that shift the leather protein fiber ionic negative (-ve) or alkaline. Using Eraser-4 first and follows with Eraser-5 to completely removed surface damages that may lighten up the stain area to match the surrounding. This removal is feather out to the entire cushion surface to the edges. Follows with a thorough vacuuming completes the dry soil removal process.

    Let have some pictures for inspection before the next step.


    Roger Koh
    Leather Care Consultant
    www.LeatherDoctor.com

  9. #9
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    Quote Originally Posted by Roger Koh View Post
    http://www.leathercleaningrestoratio...-from-dog-peed

    The system approach for dried urine stains are the same, however have to take note that the leather type and finishes may differ so tools used have to match the finishes. Use the Nubuck (N) Leather Problem Solving Guide posted above as reference. Urine under the heading of “Stain Type” is solved by the system step 1 to 7 from left to right. Steps 1 to 5 is the cleaning phase and remains until the result proves satisfactory before moving into leather rejuvenating it as the second phase with step 5 and 6. When dry it is finished with step 7.

    Now we start with the cleaning Post #7 picture #5 as follows:

    #1. Dry soil removal utilizes tools Eraser-4, Eraser-5 nubuck Brush-2 and a vacuum cleaner to remove surface soiling.
    #2. The stain area nap may have been chemically deteriorated or damaged from the urea content that shift the leather protein fiber ionic negative (-ve) or alkaline. Using Eraser-4 first and follows with Eraser-5 to completely removed surface damages that may lighten up the stain area to match the surrounding. This removal is feather out to the entire cushion surface to the edges. Follows with a thorough vacuuming completes the dry soil removal process.

    Let have some pictures for inspection before the next step.


    Roger Koh
    Leather Care Consultant
    www.LeatherDoctor.com
    #1 Urine stain cleaning
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    Last edited by koa; 04-09-2014 at 08:11 PM.

  10. #10
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    Please show pictures of the entire cushion for visual comparison of surrounding areas.

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