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Dear Giovanni, what a difference between before and after. I have considered buying a dental water jet but thought I would need a professional one because of the pressure. But you say a household one is ok? I might get a used one cheaply on Ebay.
Birgit
Hello All,
Have posted this before but I guess is buried deep somewhere in long gone thread. Denture cleaning tablets work well cleaning porcelain. I have removed stains from cracks. 3 or 4 tablets in a 5gal bucket and left over night.
Michael
Giovanni is correct - my wording was a bit unclear.
Hydrogen peroxide does not fix damage, such as crazing and hairline cracks.
As this post is about cleaning, I was not more specific with my words. I wanted only to show that peroxide can clean very effectively.
However, there needs to be further explanation about how hydrogen peroxide works, and what it works on and what it does not.
Bleaching works on ORGANIC material, NOT INORGANIC, except for iron, and that would be highly unlikely.
It will NOT change the color of enamel or glaze, or the color of the porcelain. And, it will NOT clean/change flaws that originated during the firing. These are all INORGANIC materials.
The discoloration that peroxide works are caused by ORGANIC build up such as fungus, bacteria, and dirt (the organic part) that form in the microscopic pores.
Peroxide is composed of only hydrogen and oxygen, like water, but it has an extra oxygen atom, which is highly reactive....it likes to stick to organic molecules and metals (like iron). The reaction between oxygen and other molecules is called oxidation...we generally think if it in terms of rust, but if course that is with iron and oxidation can occur with many materials.
The discoloration in porcelains, when they are from organic material (chromoplasts) bonds with the oxygen, which destroys the chromoplasts, and the discoloration disappears.
Soaking the porcelain in distilled water will help dilute the remnants of the chloroplasts, but honestly.... it's not really necessary. It will take 50+ years for the color to come back unless you leave your object in a bucket of mucky water.
If your porcelain has a high iron content, I guess if you leave it for enough time, you could get a rust reaction. But, rust occurs from slow oxidation, so I don't think that is possible under normal cleaning process condition (5-7 days).
Maybe a silly question, is this method can clean up residues from restoration?
@yinchris Mostly no.
The restoration was done with some sort of paint (inorganic). I suggest you remove all the old restorations with acetone... This is VERY effective. Then, when you can see the cracks and damage you can assess what you want to restore and/or leave as it is.
Now, there was one dark hairline crack that I saw. Peroxide will effectively remove the dark line, so you will still have a crack, but it will be less visible.
Hello,
Just as an aside I found with really stubborn or deeply set dirt, if you carbonate the water the add the Denture Tablets the bubbles help with the cleaning processes.
Yin don't think so as written by posters above these processes only work on organic residue. Old repair residue can be gently scraped off would suggest a wooden or plastic scraper to lessen the chances of scratching. Paint remover can be used but carefully as to much may go to far and your item ends up in pieces.
Michael
Giovanni, great results. Thank you for the detailed explanation.
You bring up an important point about removing the material of the stain Vs. just bleaching it and leaving the material.
Greeno107. Does peroxide break down the larger molecules or only bleach their chromoplasts? E.g., does it help remove the material or mostly make it invisible?
Thanks too for your explanations, esp. the UV angle.
@craig Color change is just the visual effect of a chemical reaction between the oxygen and the organic material, so the chromoplasts are actually broken up on a molecular level, which then causes them to loose their color.
I would say that Giovanni's method sounds to me that it removes the material on the surfaces, which may account for much of what is visible. This is a mechanical method of cleaning and may be enough for most stains.
However, the staining can and often does occur below the slip, not just along hairlines and crazing. So, I don't see another option other than soaking in peroxide, which is a chemical method of cleaning.
Every situation will have variation. But, as I mentioned before...if you have concerns of residual peroxide or remnants of broken down chromoplasts, I don't think you have much to worry about.
Peroxide is quite volatile and will break down in sunlight due to UV very quickly...just a few days. The chromoplasts are a component of the fungi or bacteria growing in the porcelain, so it has not ability to regenerate once the fungi or bacteria is killed...which is exactly what happens when it comes in contact with the peroxide.
Michael's denture tablet method looks to be a chemical method of cleaning as these tables have mild levels of chlorine bleach, and baking soda (sodium bicarbonate) is added to effervesce (make bubbles) which is likely a mild mechanical method of cleaning.
All in all, porcelain is quite inert.... it does not react with much of anything, so I think you're safe to experiment without risk of harm.
Here is what I did with punch bowl. Used acetone and baby plastic knife removed the residues- very effective. About the black line inside, soaked in 5 denture tables water for 2 nights, the line was much lighter afterwards, but still there. Then bought 3% Peroxide, soaked it in for another 2 days under the Sun. Yes. bubbles came out from the line. Then soaked in water for a day and night. The line is not dark, kind of greyish. I will guess the restoration was not done right. Here some pictures.
@yinchris If the damage was a hairline crack, I suspect it would have cleaned up nicely. However, your damage is a break that has been glued back together. I suspect the glue is preventing further cleaning.
If that is the case, a restorer will have to paint over the break to hide it.
Another possibility is to have it dismantled and reglued professionally. As it’s only two broken out pieces it shouldn’t be terribly expensive.
Birgit
@greeno107 You are right! I can feel the clueing points on the top of rim when my finger goes though. Both painting over the break and regluing sounds great, I will consult a restorer in the future. Thanks greeno107and Birgit!
I have had good luck with Oxy-clean (sodium percarbonate), which releases hydrogen peroxide when it dissolves. It will penetrate and oxidize organic material and some inorganic stains in cracks and crazing. Works best if you soak overnight. However, you have to be careful to soak the object in distilled water to remove the mineral residue afterwards (I repeat this step 3-4 times, overnight each time). If you don't rinse well, the residue will crystallize under the glaze, and can cause the glaze to flake.
There are also other brands of sodium percarbonate-based cleaners, some of which contain enzymes to help break down organic stains, but Oxy-clean has always worked well for me.
Charles
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