What temperature is China paint fired at?

03 Apr.,2024

 

CHINA PAINTING - A LONG HISTORY
This page last updated: August 30, 2011

General Introduction

The term "China Painting" usually refers to the method of painting on white glazed porcelain objects.     The paint used is an overglaze paint.    This means it is designed to be used on top of already glazed porcelain.    (as opposed to underglazes, which are generally painted on the bisque ware and fired, after which a glaze is applied.)  This type of painting is also referred to as porcelain painting or overglaze painting.

China or porcelain painting is an ancient art, the process which was developed several hundred years ago.    I'm not sure just where it originated; it may have been in China or the Near East, but don't quote me on that.

Technique

The general method China Painters use is to paint a light coat of paint on the porcelain piece.    This may involve one or more colors, after which the piece is fired.     Then more paint is applied and the piece is fired again.     This goes on, painting and firing, until the artist feels the painting is complete.     The reason for the multiple layers,   (called "fires" because of the firing operation between each)  is because of the possibility that the paint may blister or "pop" off if too much paint is applied at once.     Even so, there are some "one fire" artists.     I am not one of these.

One of the things that attracted me to China Painting is its smoothness, permanency and translucence.    It is not meant to be an opaque paint.    It is ideal to portray the smoothness of the human skin, the delicacy of the human eye, and hair and animal fur can be made to appear very realistic.    I am a realistic painter.    Although I appreciate the abstract, I prefer to paint what I see.  The subjects of choice for the majority of China Painters are probably flowers and fruit. The smoothness of the China paint also lends itself very well to these subjects.

One mistake many first-time China Painters make   (and I am not the exception)   is to think that they can correct a wrong stroke in a later fire.    China Paint has a semi-transparent appearance.     Strokes, even if covered by other strokes after the firing, are still visible.    Corrections can usually be made before the layer has been fired, but once the layer has been fired, unless the covering paint is very much darker than the layer below, the earlier painting will show through.    This means that, unlike oils or acrylics, you must plan your light areas ahead of time.     Before I learned to paint in watercolors (about 4 years ago, I thought that the planning of a China Painting would be similar to that of a watercolor. Now that I have created many watercolor paintings, I find that I was right.

Materials

Most of the China Paints are a dry powder and must be mixed with some type of oil.     There are generally two types of oils which can be purchased in a China Painting studio.     The "open" or slow drying (maybe even never drying) medium and the fast drying medium which usually dries within about 1 to 3 hours of painting.    Many China Studios sell their own versions of these two categories of China Painting oil.    The faster drying oil may contain oil of cloves.     Some China Painters still use mineral oil.     I used mineral oil years ago but have since changed to the Studio blends, although I sometimes use baby oil (which is refined mineral oil).    The problem with mineral oil is that it attracts a lot of lint.     Sometimes, even glycerin is used to mix the paints, when the paint medium is to be water-based.     This is not the usual practice, though.    Some dealers sell water-based mediums which allow the paints to be cleaned with water rather than turpentine or other solvent. There are other special oils for special paint projects, such as enameling and raised paste for gold.    I won't go into them here as I do not have a lot of first-hand knowledge in this area.    I have done very little raised paste for gold and only anticipated experimenting with enamels.

Turpentine is used to clean brushes.   Until recently, I used Turpenoid, since turpentine for me has such an irritating smell.  But the turpenoid doesn't clean the brushes as well as the turpentine.   Also, the turpentine, seems to cut a cleaner line when the cleaned brush tip is used to "wipe out" an area. So I generally use turpentine now.

The painted item is usually sanded between paintings to remove any residue of color which has not blended within the porcelain and to smooth the surface.    I used to use Denatured alcohol to wipe the sanding dust off and further clean the painted item prior to painting the next layer.  It is a procedure I was taught, and I think it is done by many China Painters. Good old soap and water (usually liquid soap or dish soap), followed by a clear water rinse, also works for cleaning the porcelain.  I have recently changed to using 90% (rubbing) alcohol instead of the Denatured Alcohol for cleaning porcelain. I think it is less toxic.

The powdered paints usually have a flux in them and if not, must have a flux added.     Flux is a fusible substance that causes other substances to melt.     Its presence in the paint allows the paint to "melt" into the glazed surface of the porcelain piece during the firing.    Since the pigments of China Painting are all mineral, they fuse at different temperatures.    The flux is combined in each of the colors in such proportions so that they will melt uniformly when exposed to the fire of the kiln.

Gold, Platinum and lusters used in china painting, although they contain a flux also, do not melt into the glaze.    They adhere to the top surface of the porcelain. That is why you often see an old plate where the gold rim has "rubbed off".    It is because it did not fuse into the porcelain.

China paints, properly fired should never rub off.    They also may be the only thing left should you be unfortunate enough to have a fire consume your home, since the heat of the kiln is usually hotter than that of a home fire.

Firing the China Pieces

Kilns can be purchased for use in firing at home.   I used to have two older heptagonal (7 sided) kilns.  I had one of the kilns for about 3-4 years and the other for over 15 years.  They were adequate for most of my projects. For larger items, I was able to get the studio where I painted and bought my supplies to do the firing for a fee.   When I moved to Hawaii in early 2000, I sold both my old kilns and treated myself to a new electronic kiln. It is like a microwave in that it had digital controls and uses no pyrometric cones. You just program in the cone temperature that you want and the speed of the firing. In addition to my larger kiln I also have a small jewelry kiln. I bought the jewelry kiln years ago when I was creating a lot of porcelain jewelry pieces. Because it was small, I was able to take it with me to Hawaii. In 2007, I purchased another larger electronic kiln.

The kilns you can buy nowadays are automatic.   When firing lusters, I generally prop the kiln lid open or I leave a peephole open) to let off the gases escaping from the metallic paint.  When you set the kiln, the temperature gradually rises from low to high automatically at a controlled rate.  (The older kilns, like the two I had before I moved from Hawaii, had two dials which had to be turned periodically from low to medium and then to high.)  Large fire brick plugs may be placed in the peepholes on the side of the kiln. There is a prop at the rim of the kiln which can be used to prop the kiln lid open at different levels.

The complete firing time can take about three or more hours but, because of the intense heat, the kiln should not be opened right after it shuts off.   Many hours are required for the kiln and the piece(s) inside to cool off enough to be removed.    

Pyrometric cones are used to indicate when the porcelain ware has reached the proper temperature to "fuse" the china paint to the piece.     These cones, which are numbered based on the temperature at which they will melt, are placed inside the kiln.

Kilnsitters

If a kiln has what is referred to as a Kiln Sitter (a device which will automatically shut the kiln off when the desired cone temperature is reached - see illustrations above), then a smaller kiln sitter cone (about 1 inch long and usually referred to as a "junior" cone) is placed in a special rod assembly extending from the Kiln Sitter into the kiln.

This assembly is composed of two parallel lower rods, on which the cone rests across, and an upper rod which rests on the top of the cone.    This upper rod is attached to a clamp on the outside of the Kiln Sitter which holds a latch which controls whether the kiln is on or off.    When the melting of the small cone causes it to bend sufficiently, it tips the upper rod which, in turn, releases the clamp from the latch, causing it to fall and the kiln is shut off.

The first illustration is of the kilnsitter assembly as seen from the outside of the kiln.    The second illustration shows the way the rods look as they protrude into the inside of the kiln.     A cone (triangular shaped) is shown resting on the lower two rods.     These cones are numbered based on the temperature at which they will melt.    Using a specifically numbered cone in the kiln sitter, causes the kiln to stay on long enough for the peices inside to reach the desired temperature. This was the way that the two older kilns I had worked.

Most China Painting is fired in the temperature range of 1112 degrees Fahrenheit to 1566 degrees Fahrenheit.    These temperatures, as indicated earlier, are expressed in cone numbers.    The actual range of cones for all ceramics (including other clays) is 1112 - 2305 degrees Fahrenheit.     The higher temperatures are for the unglazed pieces, using underglazes.     I have tried my hand at painting some underglazes, but not with as much success as the China Painting.

In the China Painting range of cone numbers, the numbers all start with a leading zero (022 through 014).    There are other leading zero cone numbers (013 through 01), but these are generally too hot for overglaze China Paints and are for Ceramic Bisque and applied glaze.    In these cone numbers with leading zeros, the higher the cone number, the lower the temperature.    The China Painter generally uses cones 019 through 015 and sometimes even cone 014.     The outer ranges are for specialized items. (Glass, for instance, is fired at cone 022.)

There is another set of cone numbers, without leading zeros, for the very high heat range (2088 - 2305 degrees).    In these cone numbers ranges (1 through 10), the higher the number, the higher the heat.   These cones are used to fire Stoneware, porcelain bisque and glazed porcelain.

Subjects to Paint

There are a multitude of porcelain items to which China Paint can be applied;    plates, bowls, cups, whole dish sets, dresser & trinket boxes, vases, lamps, handled mirror holders, teabag trays, ash trays, spoon holders, electrical switch plates (porcelain of course, not plastic), candy dishes and on and on the list goes.    In the jewelry line there are porcelain blanks for pendants, earrings, pins, hair barrettes, belt buckles, tie tacks, money clips, collar tips, bola ties and an endless variety of other items too numerous to mention.

I did the jewelry items from the time I first started china painting (around 1978-79) until I moved to Hawaii. I still have materials for doing jewelry, just haven't had the time. I did very small items (blanks size 40x30 mm, 25x18 mm and 18x13 mm).     Until my eyes give out, I can still do animals on these very small items.    A few years ago I did two small items each on an 18x13 mm porcelain china blank.    One was the head of a ram and the other was a pelican. Each of these were set into a money clip.    The jewelry items sell more readily than the larger items.    But I have sold several of my larger paintings.

Conclusion

Well, that's my version of the China Painting scene.     Hope you learned something you didn't know before.     Whether you needed or wanted to know it, well that's another story.

One caveat, the opinions expressed above are my own.     They are based on the knowledge I have gained in my experience with China Painting over the years.     There are many, more experienced and knowledgeable than I, who may differ with some of these statements.     I have endeavored though, not to pass on bad information.

If you want to learn more about china painting or you want to see some work of china painting artists, you may want to attend a china painting show or check out a china studio in your area.

The "China Shows" page of the Porcelain Painters International Online (PPIO) website lists upcoming shows. Click Here to go to that page.

The "China Studios" page of the Porcelain Painters International Online (PPIO) website lists various China Painting Studios and Shops in the United States.   Click Here to go to that page.

You can also visit the China Paint Lady's website to get another slant on China Painting.  There is a link provided to this site on the "Websites" Page, or click here to visit her website at www.geocities.com/paris/3543

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What is China Painting?

Information about a 1st fire, 2nd fire and 3rd fire using the china painting technique.

Above is an example of a 1st, 2nd and 3rd fire China Painting.

Overview

When I teach new students the china painting technique, they usually ask why china painting is fired in an electric kiln more than once? Instructions for the china painting technique often refer to a first fire, second fire, third fire and fourth fire. This article explains why a first, second and third fire is used in the china painting technique.

First of all, an electric kiln is used to fire china paint onto a porcelain blank. A porcelain blank is usually a piece of china or ceramic, such as, a vase, plate or tile with a white glaze. Basically, the china paint is painted onto the glazed porcelain blank. The painted porcelain blank is placed into an electric kiln and the temperature is set to reach anywhere between 1300 degrees to 1480 degrees. Some china painters fire their artwork as high as 1500 degrees. The temperature used, depends on the colors, technique and the desired outcome for the china painting. This technique is also used on unglazed ceramic bisque. When the porcelain is removed from the kiln, the china paint is bonded into the surface or glaze.

Many instructions for china painting can be found across the world wide web. There are as many techniques as there are artists. One thing that china painters have in common is the use of the kiln to build up layers of china paint on glazed porcelain or ceramic blanks.

The china painting technique can be completed in one firing or multiple firings in an electric kiln. The number of firings required on any china painted artwork depends on the art style, subject and whether the painting is simple or complex. The general idea is to build up the paint gradually. The reason for building up the paint gradually using the china paint technique, is to keep from injuring the glaze on the porcelain. If the paint is too heavy the glaze might chip and if the paint is too oily the paint might run. The best results are achieved by building up the paint slowly in light layers and fire more than once.

First Fire Description

A first fire china painting has a light coverage of paint with very little detail. It could be described as a base coat of color very similar to other techniques like acrylic painting or watercolor or color pencil.

The purpose of the first fire, is to paint on a light layer of color that will be bonded to the glaze on the ceramic or porcelain blank by using the heat inside of an electric kiln. This layer of china paint is important because it lays the foundation for applications of china paint on future firing sessions.

Often, after a first fire layer is finished firing in the kiln, the result is china paint coverage that is lighter as it fires into the glaze leaving a soft image like the first fire in the example photo above. The first fire can appear even lighter than the above example.

Second Fire Description

When a layer of wet china paint is painted over the first fire application of paint it is called a second fire. Usually the second fire application enhances or darkens areas on the painting. For instance, if a leaf was painted a light coat of green on the first fire, then shadow areas and medium tone areas are enhanced on the second fire. Also, the background might need more color and this is a good time to enhance the color on a background. In the example above, the center of the rose, the edges of the petals, the spaces between and on the leaves and background were painted with highlights and low lights. When this layer of paint is completed, the artwork is returned to the kiln and fired a second time. When it is removed from the kiln, the second layer of paint will be bonded to the first layer of paint.

Third Fire Description

After a second fire, additional china paint is added resulting in a third fire. A third fire application of paint can enhance shadow areas and shading which creates more visual depth to the look of the artwork.

In the above example, the shadow areas around the rose background, petals, leaves and water drop were all enhanced with china paint. Also, details were added to the center of the rose. Notice how the visual depth changed from the first fire in relationship to the third fire which resulted in a more complete painting.

On the third fire, combinations of colors like, blue and green or pansy and green were combined together on a brush and painted in areas that had the deepest shadows. Placing the same color each time over the same color only darkens the color, however, the combination of colors creates greater visual depth on a painting.

Fourth Fire and Beyond

Often china painters will fire their artwork a fourth and even more times. This all depends on the subject, the detail, shadow areas, value and tone on the painting and what the artist is trying to achieve.

Additional firings might be required for the application of gold. Or perhaps an artist might add some pen or enamel work. Some artists fire fiberglass onto porcelain blanks first and then begin painting their artwork. These are just a few techniques that might require additional firings.

Firing Temperatures for First, Second and Third Fire

I tend to fire the gold and iron colors in the range of Cone 015 to Cone 014 or (1480 Degrees) Cadmium colors need to be fired cooler in the range of Cone 019, 018 or 017. Test firing these colors in your kiln will acquaint you with the proper temperature range for your paint.

In summary, paint with your gold and iron colors early in the painting process. Often a china painter will paint with the gold colors first and then add the reds later in the painting process so that the final painting can be fired at a lower temperature to set the red. Cadmium based china paint would be added last and not as an overlapping color onto a gold based or iron oxide color so that it doesn’t cause colors to disappear or burn out. More information about cadmium, iron and gold china paint can be found at the Information about China Paint Colors link.

With practice, the china painting technique can be mastered easily and offers many options for creating one of a kind heirloom paintings.

E-mail: 💌 marylou@maryloulaberge.com

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What temperature is China paint fired at?

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