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View Full Version : Aniline (Sauvage) - How to Remove Urine Stains from this absorbent Aniline Leather Cushion?



Jermaine
05-14-2010, 01:02 PM
1.
http://i876.photobucket.com/albums/ab324/jermaine_050/5-14-10206.jpg

2.
Back of cushion.
http://i876.photobucket.com/albums/ab324/jermaine_050/5-14-10207.jpg

3.
http://i876.photobucket.com/albums/ab324/jermaine_050/5-14-10208.jpg

4.
Inside of cushion.
http://i876.photobucket.com/albums/ab324/jermaine_050/5-14-10209.jpg

Roger Koh
05-16-2010, 12:27 PM
What’s the Leather Type?
This leather is sure aniline leathers without much of a gloss and could be of a matte-waxy type.

What we See?
Pictures 2, 3 and 4 show both black and white stains.
The black stains we see are the fugitive “tanning agent” – that when completely diminish will revert the leather back to “rawhide” with tackiness when damp.
The white stains we see are the fugitive “fatliquor” – that spews to the surface and when dries makes the leather stiff and it may cracks when flex in extreme case.

What Causes the Damages?
These above “Stiffness and Tackiness” damages are due to the breaking of hydrogen-bond between the protein leather fibrils and these two main leather constituents – the tanning agent and the fatliquor.
The culprit is the urea in the urine that when aged and ferments with the natural bacteria from the atmosphere turns alkaline.
When alkaline is introduced to the protein leather fibrils above the leather iso-electric point; it ionic charges the protein fibers negative (-).
These tanning agent and fatliquor is anionic (negative [-]) too.
So, “like poles repel principle” applies here, thus the result of the leaching away of the tanning agent and the fatliquor.

Why Urine Smell?
Fresh urine typically has little odor.
The offensive urine smell begins once it start to decay and release ammonia gas.
The second level of decay releases mercaptan (a foul-smelling organic compound), which comes from the same family of odor as skunk spray.
These phosphor salts from the urine react in the presence of heat and humidity to release odor.
Cats tend to urinate in the same spot and in turn it release more pungent odor each time.

Why Microbial Growth?
Natural bacteria includes mold and mildew attack the urine.
As it breaks down, it causes unsightly stains and discoloration and actual deterioration to the leather.
Mold growth can be easily detected by its characteristic musty odor.

Why leather Discoloration?
While fresh urine begins as an acid, the phosphor salts that remains turns alkaline.
It is the alkaline phosphorus salt that begins to strip the acid aniline dyes thus causing discoloration to the leather.


These are the recommended procedure to decontaminate the urine stain.

First is to remove as much dried up stains as possible with leather Brush-1 and leather Eraser-4 on the smooth side and suede Brush-3 and Nubuck Eraser-5 on the suede side.

Leather Decontamination Phase:

Step 1 – To remove the protein component of the urine stain.
Use d’Protein-11.0 and soak into the stain following where the urine has penetrated into the leather structure.
This process removes the protein content of the urine stains.
Apply, soak, dwell, agitate and extract until towel shows clean.

Step 2 – To deodorize the obnoxious odor.
Use d’Odor-4.5 as an odor counteractant to neutralize the unpleasant odor.
Apply, soak, dwell, agitate and extract until towel show clean.

Step 3 – To neutralize the alkaline phosphorus salt.
Use d’Urine-2.1 to stabilize the leather structure pH chemistry integrity.
Apply, soak, dwell, agitate and extract until towel shows clean.

Step 4 – To rinse off all residue.
Use Rinse-3.0 to remove all residues.
Apply, soak, dwell, agitate and extract until towel shows clean.

Step 5 – To treat with Bactericide.
Use d’Bacteria-3.7 to disinfect and control pungent odor causing bacteria activities after decontamination cleaning.
Apply and soak.

Step 6 – To treat with Fungicide.
Use d’Mold-3.6 to disinfect and control musty odor from mold activities after decontamination cleaning.
Apply and soak.


Leather Rejuvenating Phase:

Step 1 – To hydrating the leather structure.
Use Hydrator-3.3 to redistribute and balance out the leather constituents within the leather structure for a better even appearance when the leather dries.
Apply and soak up the entire cushion and leave to dwell with control evaporation.
It’s more effective if the entire cushion is seal up and dwell without evaporation up to 2 days.
When the plastic transparent seal is removed, leave it to slow natural drying and extraction can be done at every 2 hours interval to extract more of the foreign contamination.

Step 2 – To replenish leached-out fatliquor.
Use Fatliquor-5.0 to strengthen and soften for suppleness when the leather dries.
This combine hydrating and fatliquoring would also enrich the coloring in the process as the leather dries.


Let’s see some pictures before I continue!


Roger Koh
Leather DoctorŽ