Overview
Ivory Black is a historical pigment originally produced by charring ivory, now more commonly made from calcined animal bones (bone black) or synthetic carbon compounds. Its name persists from Renaissance-era practices, though modern versions prioritize ethical and sustainable sourcing. The pigment is classified as a carbon black variant, distinguished by its slightly bluish undertone compared to warmer lamp blacks. In contemporary use, Ivory Black serves as a staple in artists' palettes and industrial applications. Its superior lightfastness and chemical stability make it preferable to organic black pigments. Modern production typically involves controlled pyrolysis of bones (excluding ivory) at 400-600°C, yielding a material composed of ~10% carbon and ~90% calcium phosphate.
Physical and Chemical Properties
As a carbon-based pigment, Ivory Black exhibits exceptional thermal stability and chemical inertness. Its particle size ranges from 0.1-10 microns, contributing to smooth dispersion in binders. The calcium phosphate content (from bone ash) slightly reduces tinting strength compared to pure carbon blacks but improves adhesion in oil and acrylic mediums. The pigment's neutral hue (CIELAB values approx. L*15-20, a*0, b*-2) makes it invaluable for color mixing without unwanted warmth. Unlike many organic pigments, it shows no fading under UV exposure (ASTM Lightfastness I rating). Its oil absorption value ranges 40-60 g/100g, requiring appropriate binder adjustments in paint formulations.
Main Applications
In fine arts, Ivory Black is a preferred black for oil, acrylic, and watercolor paints due to its mixability and transparency in glazes. Manufacturers like Winsor & Newton and Gamblin continue offering it in professional-grade paint lines. Industrial uses include ceramic stains (where calcium phosphate acts as a flux) and specialty plastics requiring heat-stable coloration. The printing ink industry utilizes micronized versions for archival document inks. Recent developments see application in electrochemical devices, where its conductive carbon matrix and mineral content prove advantageous. Unlike synthetic carbon blacks, bone-derived Ivory Black contains natural micropores that enhance performance in certain catalytic applications.
Safety and Storage
While generally safe, Ivory Black powder requires standard particulate controls. The OSHA Permissible Exposure Limit (PEL) for carbon black applies (3.5 mg/m³ respirable fraction). NFPA rates it as Health 1, Flammability 1, Reactivity 0. Containers should bear GHS precautionary statements P261 (avoid breathing dust) and P405 (store locked up). Long-term storage demands protection from moisture absorption, which can lead to clumping. Industrial users should note that bone-derived variants may contain trace calcium compounds that could react with acidic components in formulations. Synthetic alternatives eliminate this concern while matching optical properties.
B2B Procurement Guide
Commercial buyers should specify whether bone-derived or synthetic Ivory Black is required, as this affects pricing and regulatory documentation. Ethical sourcing certifications (e.g., CITES compliance statements) are critical for bone-based products. Technical specifications should address particle size distribution (typically D50 2-5μm for art-grade) and residue on ignition (≤2% for premium grades). Bulk purchases (≥1 metric ton) commonly see 10-15% price reductions. Leading manufacturers include Kremer Pigmente (Germany) and Natural Pigments (USA), with Chinese suppliers offering competitive pricing for industrial grades. Sample testing should evaluate dispersion characteristics in the intended medium, as milling history significantly affects performance.
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