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Thread: Givenchy - Suede Pandora bag with a month old coffee stain.

  1. #1
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    Default Givenchy - Suede Pandora bag with a month old coffee stain.

    Below is a photo of my Givenchy Suede Pandora bag.

    A month ago I spilled coffee and tried washing it off with water & soap but to no avail...

    I recently bought Grandmas Secret spot remover in the hope that the old coffee stains may be removed, but then I cam across the thread of your conversation.

    Is there any best way to fix the stain or is the stain permanent?


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  2. #2
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    Givenchy Suede Pandora bag with a month old coffee stain.

    Below is a photo of my Givenchy Suede Pandora bag. A month ago I spilled coffee and tried washing it off with water & soap but to no avail...

    I recently bought Grandmas Secret spot remover in the hope that the old coffee stains may be removed, but then I cam across the thread of your conversation.

    Is there any best way to fix the stain or is the stain permanent?

    Black coffee when dry is basically the tannin (plants and vegetable derived coloring) and the sugar content that may turn yellow or caramel as it ages which is easily dealt with by Leather Doctor ® d’Tannin-3.5 system.

    Coffee with cream or milk may tends to coagulate that gives the suede an extra stiff feel and is first removed with d’Protein-10, neutralized with Acidifier-2.0 prior to treating the tannin or caramel coloring.

    The above products mentioned suffix indicates the pH value of the products.

    “Water” suppose to be neutral with a pH value of 7 will still leave rings or marks if left alone to dry without neutralizing with an acidic leather-safe solution.

    “Soap” has its setback, as all soap will leave a scum that further attracts soiling like a magnet commonly seen in washbasin and bathtub. Most soap are alkaline and not suitable for leather cleaning, except for specialty protein stain removal that has to be neutralized thereafter to retain the leather pH chemistry integrity.

    “Grandmas Secret Spot Remover” – we need to know tis pH value as alkalinity will slowly denatures the leather (suede) and revert to rawhide or skin. In extreme cases the suede/leather will turn tacky when test with wet fingertips.

    Solution to the problem will need to have better picture taken to show where the stain is and test the feel of the stain area to detect any change in the suede texture, determine if there is cream or milk in the coffee to treat it accordingly.

    Roger Koh
    Leather Care Consultant
    www.LeatherDoctor.com


    Product information:


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    Leather Doctor Kit S5.ns – Suede Tannin Remover Kit
    Leather Doctor® Kit S5.ns, suede tannin stain removal kit is designed to remove cellulose stains such as coffee, tea, wine and other stains that derive from plants and vegetation will probably be removed with d’Tannin-3.5. It is a waterbased leather-safe tannin stain remover. Surface residue is removed with Clean-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 suede leathers. For fine suede, treat it as nubuck (Kit N5.ns) using nubuck Brush-2 / Eraser-4 instead.



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    Leather Doctor Kit S5.ps – Suede Protein Remover Kit

    Leather Doctor® Kit S5.ps, suede protein based stain removal kit is designed to remove 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 suede leathers. For fine suede, treat it as nubuck (Kit N5.ps) using nubuck Brush-2 / Eraser-4 instead.

  3. #3
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    >>> “Grandmas Secret Spot Remover” – we need to know tis pH value as alkalinity will slowly denatures the leather (suede) and revert to rawhide or skin. In extreme cases the suede/leather will turn tacky when test with wet fingertips.


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    From information received the pH value 10 - 11 is too high for leather or suede. Leather-safe pH value should be between pH 3 – 5. Between the alkaline over-exposure average of pH10.5 and pH 4 as the iso-electric point or leather neutral the difference is 6.5 point of the pH scale. pH value is calculated in the power of 10, thus at pH 10.5 it is 5’000’000 (five million) times ionic more negative. pH above the pH neutral (pI) of leather or suede will shift the protein leather fiber ionic negative as leather protein fiber is an “amphoteric” material. As the other leather constituents being non-amphoteric are also ionic negative, double negatives breaks the hydrogen bond between them (as poles repels like magnets) the leather denatures, reverts to rawhide and is detectable either as tackiness from the weakening tanning agent, stiffness from the fatliquor and discoloration from dyestuff.

    A low pH Acidifier-2.0 is the solution to rectify the imbalance if it is not over the pH chemistry integrity threshold.

    Note:
    The III Physical Data column “Percent Volatile” 33 - 34 suggest the solvent content, and such dries the leather of its original fatliquor as well – producing a stiffer and weaker nap when dry.


    Roger Koh
    Leather Care Consultant
    www.LeatherDoctor.com
    Last edited by Roger Koh; 02-12-2014 at 04:02 PM.

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