The Chinese and Asian Art Forum. For Fans, Collectors and Dealers.
Basic Rules For the BidAmount Asian Art Forum: Talk about whatever you want. You can even discuss and offer things that are for sale if they are authentic. Maximum image file size per post is 2 MB. Images of 700pxl x 700pxl are optimal if saved at a medium resolution. Be respectful of others and enjoy yourself. Click the YouTube link for a brief tutorial on using the forum. You can also EMBED Videos by cutting and pasting from You-Tube, Vimeo etc.
NOTE: To post an item or add a new post, click open the category title from the FORUM LIST, and CLICK the Blue ADD TOPIC button.
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
Latest Post: Large Oxblood Vase Brand New? Our newest member: Povilas Mickevicius Recent Posts Unread Posts
Thanks for visiting "The BidAmount Asian Art Forum | Chinese Art"
If you sell on eBay, or have a shop feel free to post images and descriptions and links.
Check back often for discussion about the latest news in the Chinese art and antique world. Also find out about the latest Asian art auctions at Sotheby's, Christie's, Bonhams and Tajans.
Auction results for: fine porcelain, ceramics, bronze, jade, textiles and scholar's objects. As well as Japanese, Thai, Vietnamese and other Asian cultures.
Thank you,
Peter Combs
Topics and categories on The BidAmount Asian Art Forum | Chinese Art
Kangxi vases, Kangxi dishes and chargers, Kangxi ritual pieces, Kangxi scholar's objects, Qianlong famille rose, Qianlong enamels, Qianlong period paintings, Qianlong Emporer's court, Fine porcelain of the Yongzheng period. Chinese imperial art, Ming porcelain including Jiajing, Wanli, Xuande, Chenghua as well as Ming jades and bronzes.
Join the BidAmount Chinese and Asian art discussion board and forum today
The BidAmount Asian Art Forum | Chinese Art
A free Asian art discussion board and Asian art message board for dealers and collectors of art and antiques from China, Japan, Korea, Thailand, Cambodia, Vietnam and the rest of Asia. Linked to all of the BidAmount Asian art reference areas, with videos from plcombs Asian Art and Bidamount on YouTube. Sign up also for the weekly BidAmount newsletter and catalogs of active eBay listing of Chinese porcelain, bronze, jades, robes, and paintings.
The art of calligraphy - and for the ancient Chinese it certainly was an art - aimed to demonstrate superior control and skill using brush and ink. Calligraphy established itself as one of the major Chinese art forms during the Han dynasty (206 BCE - 220 CE), and for two millennia after, all educated men were expected to be proficient at it.
The Museum’s collections of Asian art span nearly five millennia and encompass the cultures of China, the Himalayas, India, Japan, Korea, and Southeast Asia. In 2007, the Museum launched an initiative to create dedicated galleries for the collection, beginning with a gallery for the arts of Korea ...
Chinese art is full of symbolism, in that artists typically seek to depict some aspect of a totality of which they are intuitively aware.
China Online Museum is the finest online museum of Chinese art. It features Chinese calligraphy, painting, ceramics, bronzes, carving, and other artworks.
Chinese Ceramics & Works of Art. Overview Upcoming auctions Contacts Auction results ... Christie’s sales of Chinese ceramics and works of art showcase centuries of Chinese history. Held throughout the year in London, New York, Paris and Hong Kong, they attract a wide audience of collectors and connoisseurs vying for pieces as diverse as ...
Explore Asian Art Week. Contact the Specialist Department. Chinese Paintings ... Senior Specialist, Head of Sale. [email protected]. Tel:+1 212 641 5760. Bid in-person or online for the upcoming auction:Fine Chinese Paintings on 10 September 2019 at New York. Bid in-person or online for the upcoming auction:Fine Chinese Paintings on 10 ...
Discover an abundance of must-see art from all corners of a vast continent at Christie’s NY Asian Art Week. From contemporary classical and Chinese paintings to works with exemplary provenance from the Art Institute of Chicago, our Rockefeller Paza galleries will be full of ancient treasures and contemporary masterworks in a salute to the vibrant arts of Asia.
Sold to benefit The Art Institute of Chicago’s Asian Art Acquisition Fund, the sale features 84 lots with a focus on Ming and Qing porcelains, and offers a rare insight into the taste for collecting Chinese ceramics and works of art in the Midwest from the end of the 19th century through the 1980s. Highlights include two Wanli wucai garlic-head vases, a Qianlong mark and period, blue and ...
Specialist, Chinese Paintings, Christie's London Dr Malcolm McNeill is a Specialist in Chinese Paintings at Christie’s, based in London. He previously worked as an assistant curator of the Chinese collections and the Victoria and Albert Museum in London, as a researcher at the British Museum, and as a translator and tour guide at the National Palace Museum in Taipei.
The Christie's Education 2020 Conference: The Chinese Art Market 18 Jun 2019 Christie’s Education is delighted to announce our first international academic conference in Asia which will take place in Hong Kong from 26-27 November 2020 at the Hong Kong Convention and Exhibition Centre and will run in parallel with Christie’s Hong Kong Autumn Auctions.
The summer Chinese Art sale in Hong Kong will feature works of art from several private collections, including Qing porcelains and textile from the collection of the legendary Chinese art dealer A. W. Bahr (1877–1959), fine gilt bronze Buddhist sculptures from an old Hong Kong collection, an East Asian collection of Qing dynasty wine cups and jades, and a Japanese collection of Song ceramics ...
Sotheby's Chinese Works of Art Department holds two auctions each year in London, New York, Hong Kong and Paris.
Chinese Art - View Auction details, bid, buy and collect the various artworks at Sothebys Art Auction House.
With more than 340 Chinese works of art dating from the Neolithic to the Republic periods, highlights of this sale include a selection of Qing Imperial monochromes from the collection of Arnold and Blema Steinberg, early ceramics from the Art Institute of Chicago and Chinese porcelain and works of art from the collection of Henry Arnhold.
Results: Sotheby's Asia Week achieved $52.4 million in six strong auctions, exceeding pre-sale estimates. With 76.5% of lots sold and 60.3% of lots surpassing high estimates, the Asian art sales at Sotheby's indicate continued collector interest in the finest works of art from China, India and and the Himalayas.
Today's sale of Important Chinese Art will proceed as planned with sessions at 10 AM and 2 PM EDT. Sotheby's will be monitoring the weather conditions throughout the day and will be available to coordinate alternative bidding options should conditions make it difficult for clients to attend the auction in person.
Bonhams Chinese Art department is renowned for offering the finest works of art representing the richness and breadth of China's artistic heritage, particularly Imperial porcelain, white and spinach green jades, cloisonné and Buddhist art. Specialised international auctions are held globally, including London, Hong Kong and San Francisco.
Bonhams : Chinese Works of Art We use cookies to remember choices you make on functionality and personal features to enhance your experience to our site. By continuing to use our site you consent to the use of cookies. Please refer to our privacy and cookie policies for more information.
Bonhams Fine Art Auctioneers & Valuers: auctioneers of art, pictures, collectables and motor cars. We use cookies to remember choices you make on functionality and personal features to enhance your experience to our site. By continuing to use our site you consent to the use of cookies. ... Chinese Art (US) General enquiries
Bonhams : Fine Chinese Art We use cookies to remember choices you make on functionality and personal features to enhance your experience to our site. By continuing to use our site you consent to the use of cookies. Please refer to our privacy and cookie policies for more information.
Bonhams Fine Art Auctioneers & Valuers: auctioneers of art, pictures, collectables and motor cars Bonhams : Asian Art We use cookies to remember choices you make on functionality and personal features to enhance your experience to our site.
Bonhams are international auctioneers of fine Chinese and Japanese art. We specialise in rare Imperial and Export Chinese ceramics and works of art, as well as Japanese ceramics, fine and decorative works of art from the Neolithic Period to the 20th century. View on map
Bonhams Fine Art Auctioneers & Valuers: auctioneers of art, pictures, collectables and motor cars. We use cookies to remember choices you make on functionality and personal features to enhance your experience to our site. By continuing to use our site you consent to the use of cookies. ... Asian Art Bonhams. Work. 22 Queen St.