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What are these stains on pottery? They occur due to seepage of moisture through very small (and sometimes invisible to the naked eye) cracks in the glaze often referred to as crazing, crackle or pin holes in the glaze. The penetrated moisture combined with organic matter (Tea & coffee, oil, fat, food, dust, etc.) evolves into a bacteria that typically is brown or black sitting between the glazed craze lines or in the clay body under the glaze. Therefore, scrubbing the surface will not help. Bacteria stains are more likely to occur on earthenware or stoneware due to the ceramic higher porosity allowing the moisture to penetrate deeper and stay wet creating perfect enjoyment for bacteria to flourish.

High fire ceramic such as porcelain, which has almost no porosity, will less likely stain. What is crazing / crackles and why do they happen? They are a network of lines or cracks in the fired glazed surface. They usually occur at the end of the kiln firing process when the outside surface cools before the clay body under the glaze. Crazing can also happen during the vessel’s life time during rapid temperature changes (day/night, hot water / cold water, etc.). Often, for aesthetics reasons, the crazing effect is introduced by design and on purpose on Japanese, Chinese or Raku dishes or vessels – see examples above.

More involved and more effective process: From a pharmacy or a beauty supply store, purchase 8% Hydrogen peroxide bleach that is typically used to bleach hair. Soak your stained item in the solution for several hours.

Flash element td 2 hacked. Then, while wet place it in an oven and set to 180 to 200 degrees F. Let the oven rise to 180-200 degrees while your item is in the oven.

WARNING: Do not enter your item to a preheated oven. The rapid temperature change could crack the item or chip off some of the crazed glaze. After 30-60 minutes, take it out, wait for it to be cooled to room temperature and wash it with room temperature water. You will see slightly colored water seeping out from the crazing washing off. ** ** While this removes the color it does not remove the foreign matter (dirt etc.) causing the stain, thus, stain can reappear if introduced to moisture. I'd imagine the pros don't want to do it for OTHERS, because if something happens to the piece, they don't want to be responsible.

I'm sure they do it for their own pieces. This is an excellent explanation of 'how to' and the cautions involved.

If you have a piece that needs care or it needs the trash, this is a great in between choice. I've used the tips and they do work, just not on everything. I brightened a very pretty, but very stained old flower pot with no ill effects.