Zaffre: The Deep Blue Alchemical Pigment
In the world of historical pigments, few colors possess the depth and intensity of Zaffre (also spelled Zaffer in American English). This striking deep blue substance bridges the gap between ancient alchemy and industrial art, serving as a primary source for the vivid blues found in historical glassware and ceramics.
What is Zaffre?
Zaffre is a prescientific or alchemical substance used as a pigment. It is produced by roasting cobalt ore, resulting in a material composed of either an impure form of cobalt oxide or impure cobalt arsenate. Because of its chemical composition, it provides a powerful coloring agent that remains stable under high temperatures.
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Historical Applications and Usage
The use of zaffre dates back centuries, with the first recorded mention of the term as a color name in the English language appearing sometime in the 1550s.
During the Victorian Era, zaffre played a critical role in the decorative arts. It was primarily used for two purposes:
- Preparing Smalt: Zaffre was a key ingredient in creating smalt, a potassium glass colored with cobalt.
- Glass Staining: It was used directly to stain glass a deep, rich blue.
Technical Color Specifications
In modern digital terms, Zaffre is categorized as a "Deep Blue." Its precise coordinates ensure consistency across different color models, from web design to scientific imaging.
| Coordinate System | Value |
|---|---|
| Hex Triplet | #0014A8 |
| sRGB (r, g, b) | (0, 20, 168) |
| HSV (h, s, v) | (233°, 100%, 66%) |
| CIELCh uv (L, C, h) | (21, 81, 265°) |
| ISCC–NBS Descriptor | Deep blue |
Key Facts
- Composition: Made from roasted cobalt ore, consisting of impure cobalt oxide or cobalt arsenate.
- Primary Use: Historically used for staining glass and producing smalt.
- Etymology: First appeared in English color nomenclature in the 1550s.
- Visual Profile: A saturated, deep blue identified by the hex code #0014A8.
Frequently Asked Questions
What is the difference between Zaffre and Zaffer?
There is no chemical difference; Zaffre is the standard spelling, while Zaffer is the common spelling used in American English.
How was Zaffre produced?
It was produced through the process of roasting cobalt ore, which created the impure cobalt oxide or arsenate needed for pigmentation.
What is smalt, and how does Zaffre relate to it?
Smalt is a blue glass pigment. Zaffre was used as the coloring agent to prepare smalt during the Victorian Era.
When did the term "Zaffre" first enter the English language?
The first recorded use of Zaffre as a color name in English occurred sometime during the 1550s.
What are the digital color values for Zaffre?
Zaffre is represented by the hex triplet #0014A8 and sRGB values of (0, 20, 168).