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What the controversy about Oxblood red pots?

(From Green Meridian on Facebook)

Speaking of oxblood red pots, what’s the controversy about this color?

The controversy surrounding oxblood red pots does not stem from a political or ethical scandal, but rather from intense historical lore, chemical volatility, and authentication debates within the ceramics community.The friction centers on three primary areas:

1. Macabre Historical Lore: Oxblood red glaze (historically known as sang de boeuf or Langyao) was originally developed during the Ming and Qing Dynasties in China. Because the vibrant crimson color was notoriously difficult to replicate, a famous myth persisted that a desperate ancient potter threw himself into the kiln to achieve the color.The legend claimed the iron in human blood gave the pots their deep red color. While scientifically false—the color actually comes from copper oxide fired in a reduction (oxygen-deprived) atmosphere—the "sacrificial" history still sparks debate over the origin and naming of the glaze.

2. The Chemistry Debate: Iron vs. CopperAmong potters, there is a recurring, pedantic debate over what constitutes a "true" oxblood glaze.The Reality: Authentic oxblood is a copper-based glaze fired to high temperatures (Cone 10) in a reduction kiln.The Confusion: Because iron oxide is traditionally associated with red hues in clay, beginners frequently argue that iron is the secret ingredient. Additionally, some modern commercial glaze manufacturers market mid-range oxidation glazes under the name "Oxblood," which traditionalists argue is an inaccurate and misleading label.

3. Antique Authentication and "Flawed" Qualities: in the art world, controversy often arises when identifying genuine antique Chinese oxblood pieces. True oxblood glazes are highly fluid and runny. As a result, authentic antique pieces almost always feature specific "flaws":The glaze frequently runs down and thickens at the base of the pot.It burns out or leaves a white/greenish streak near the rim.It possesses a distinct, fine crackle network across the surface.

Appraisers and collectors often clash over pieces that look perfectly uniform. If a pot has a flawless, non-running red glaze without a crackle pattern, purists argue it should be classified as a standard "copper red" or a low-fire enamel fake rather than true oxblood.

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For residential design-build folks in particular…

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