Is one heat enough for pottery

Once the pottery is heated, the glaze is more likely to break because the mechanical bond between the body and the glaze is difficult to maintain and maintain.
If the glaze is applied on hard leather, it should be pressed with the body.
During the early stages of heating, pottery is also subject to volumetric and chemical changes
Is placed, which leads to the production of gases that make it difficult for the glaze to remain stable.
When glaze is used on hard leather on pottery, you must be able to compress it.
Balance by adjusting the amount and nature of pottery soils in its composition.
Once heated pottery, especially during the water vapor cycle, should not be heated too quickly.
Before heating, make sure the pottery is completely dry.
Under wet conditions, the powder-like layer may absorb water from the air, leading to slight expansion and loss of adhesion.

Is the drying of the glaze too slow

Is the drying of the glaze too slow?
If the glaze dries very slowly, the brittle adhesion process will take longer and the dried glaze layer may break.
Also, during drying, bubbles may form in the wet glaze layer
There, these areas become parts where there is no adhesion
It does not exist with the lower body and therefore can stimulate glazing and rupture glaze during the melting process.

This happens if the pottery is very thin, the glaze contains a lot of water, or if the pottery is already wet when you apply the glaze.
Preheat unglazed pottery to speed up the drying process
(150 ° C in kiln, increase temperature if more temperature was needed),
Do separate interior and exterior glazing, thicken the pottery to better absorb water, or apply the glaze in a thinner layer.

Does the dry glaze adhere to the surface of the pottery improperly

The mechanism of adhesion and bonding is simply due to physical contact, the hardness of the surface of the pottery
They are difficult to integrate with the glaze, and this determines the "durability" of the adhesion of the two.
Some surfaces are also very soft.
In order to be able to make the glaze stick better and more durable,
There should be some pottery soil in the glaze composition so that both are suspended in the aqueous material and the dried layer hardens.
If the pottery is very powdery, it is a sign that the soil is pottery
Add more ductile, add a little bentonite or add a stiffener like step.
Add steps to the glaze to make it stick better to the pottery.
If the glaze is dispersed, it probably lacks the necessary slack to deal with
There are small irregularities in the pottery and it holds its place firmly.
Wetting agents are present and can be added to aqueous material to improve adhesion.

Does the glaze shrink sharply as the pottery dries

If fine materials (such as zinc, magnesium carbonate) are present, it will cause more shrinkage and compaction during drying.
Use of calcined zinc, artificial bone ash or any other source of calcium,
Try talc or dolomite to replace magnesium oxide with magnesium carbonate.

It is natural to see 20% of pottery soil in pottery.
If there is a significant amount more than this, try to use soils that have less ductility.
You may have to do some calculations to make these corrections.
Finally, you need to measure the content of the glazed soil to achieve a medium of suitable hardness and a minimum of shrinkage and shrinkage.

Application of paraffin wax

Application of paraffin wax:
The wax, which was initially solid, melted during heating and liquefied.              
A sponge is shaped so that it has a sharp point to dip into the liquid wax
And was freely used to apply wax on unglazed pottery.
The wax must be dried before the glaze can be applied to the pottery.

Broken glaze

"Broken glaze" in pottery is usually associated with a defect or defect that is caused by a number of physical or chemical disorders.
Knowing this defect causes concern in the art of glazing.
Over time, potters came up with solutions to the problem and used the flaw in glazing as a design element.
This research has used a completely different method to deliberately break the glaze using paraffin wax.
The method of using wax was intentionally used to create patterns in the form of "glaze ruptures".

At a stage when the pottery is not yet glazed, the paraffin wax is melted
In order to strengthen some parts of pottery, it was used as a stimulant and led to
It also dried, wax-resistant pottery was covered with glaze and allowed to dry.
The pottery was heated with a glaze between 1200 and 1300 ° C in kiln.
This resulted in the production of brown glaze against resistant areas with a light background.
As a result, it was a creative way of glazing a woman that was admired by everyone.

The role of the mold in the pottery wheel

To remove larger pottery from the potter's wheel requires a device called a mold. In fact, each pottery needs a mold and it is better to always have a number of molds ready.
The mold is a round earthenware or wooden plate that is exactly the size of a pillowcase. The only difference is the thickness of the mold, which is slightly thinner than the steering wheel on the wheel. Keep in mind that molds must be used to make pottery the size of a vase and larger. Otherwise you will have trouble removing the pottery.

Differences between pottery and ceramics:

Differences between pottery and ceramics:
Pottery and ceramics have been associated with human culture for thousands of years and contain most of the archaeological discoveries. Not only in the historical background of Iranians but also in religious insight and traditional medicine, much emphasis has been placed on the use of these dishes in cooking and so on. In contemporary life, the role of these dishes around us is quite noticeable, whether in functional products or in decorative structures.

The question that often arises is what is the difference between pottery and ceramics, especially in utensils?
The answer to this question is not so complicated. Ceramics are more common than pottery. Pottery products are made from clay and are made by hand with a potter's wheel, but ceramic or slurry products are made from a combination of clay and several other types of soil and materials.

Pottery or earthenware is made of clay and secondary soils that have high adhesion and a lower degree of firing. While ceramic dishes refer to bodies that are with primary soils such as a combination of kaolin, quartz, silica and stoneware soil and have less adhesion to secondary soils and require a higher degree of firing more than 1080 ° C and also have a higher glaze than pottery. Is.

Pottery and ceramic products are either glazed or unglazed. Paint and glaze is in fact the shiny and transparent coating on pottery and ceramics, which in addition to beauty increases the strength and durability of dishes. The type of paint and glaze depends on the type of formula and its ingredients. Therefore, by combining the ingredients of the glaze in different amounts, a new paint and glaze can be invented. The most important types of glazes are lead glaze, ash glaze and feldspar glaze.

What distinguishes the color and glaze of ceramics and pottery is the transparency and colorability, which in pottery due to the red color of iron in clay causes darker colors and maturity. For example, the turquoise color on the pottery bed is slightly darker due to the red pigment, but on the ceramic bed it is clearer and without redness. For this reason, the number of paints used on ceramic dishes is much more than pottery.

To glaze pottery and ceramic dishes, they must be heated to a certain temperature. If the temperature is too high, the glaze will burn. For this reason, in order to perform the glazing steps correctly, the container must be placed in a suitable temperature range.

What is a clay yogurt jar?

What is a clay yogurt jar?
Clay yogurt jar (size: small) - single is one of the most common and widely used utensils in Gilan province, one of the advantages of using earthenware is water absorption, which is a reason to increase the quality and whiten yogurt. Is. Yogurt Abstract Due to the fact that it is in earthenware, it has a very tasty taste and is high in calories. These pottery are made entirely by hand and pottery and are baked at a temperature of 1000 degrees Celsius. Yogurt jars available in Gili Shop are available in three sizes: small, medium and large. The use of these pottery is suitable for homes, restaurants, halls and coffee houses and bring you a completely traditional environment.

Washing pottery is the most important step in its preparation

Washing pottery is the most important step in its preparation
After you have shaved your product, it is time to wash them thoroughly, we do this to remove the sharpness from the lathe and make all the surfaces of the product smooth and even. The wash is done with a sponge dipped in water, the sponge is taken out of the water and all the water is squeezed so that the sponge becomes soft and moist. Then we perform the abrasion operation on the cut lines in a reciprocating manner, by doing so, we practically make the outer surface of the product ready for self-glazing, and then the glaze on the product shines completely, but in some workshops when As a result of the movement of the sponges, stains fall on the product with the help of special fabrics to erase these lines to make your product more beautiful than before, now your product must be dried again and left in the space for a few hours. We set the freedom to dry completely due to the impact of air to be ready to enter the oven.