Ferrous Sulfate - Iron (II) Sulfate - FeSO4 - Crocus Martis

Premium Crocus Martis (Anhydrous Ferrous Sulfate) – The Classic Iron Colorant for Deep Reds & Unique Effects

Unlock rich, earthy iron tones and subtle pyro enhancements with high-purity Crocus Martis – the traditional calcined ferrous sulfate (FeSO₄ anhydrous, also known as calcined copperas) that's a historic favorite for delivering warm reddish-brown hues, speckled textures, and reliable performance in glazes, pigments, and select pyrotechnic applications.

This fine, reddish-brown to purplish powder (often with a subtle bluish tint in micronized grades) acts as a potent iron source with residual sulfur influence, providing stronger coloration and unique variegation compared to standard red iron oxide. It's prized for its solubility (in some forms), heat stability, and ability to produce deep, velvety reds or rustic speckles without the uniformity of synthetic Fe₂O₃.

Key Advantages:

• Intense iron coloration — Yields deeper reds, maroons, and speckled effects in ceramics and pigments
• Historical authenticity — Traditional "Crocus Martis" for authentic Renaissance-era or artisan finishes
• Versatile & reactive — Residual sulfate can influence reactions for unique textures or subtle pyro boosts
• Fine & consistent — Excellent particle size for smooth dispersion, low moisture, and batch reliability
• Multi-use powerhouse — Bridges ceramics, art pigments, and niche pyrotechnic needs

Perfect For:

• Ceramics & glazes — Substitute or enhancer for red iron oxide in cone 6–10 oxidation/reduction; creates rich terra-cotta reds, crystalline effects, or maroon terra sigillata
• Pigments & paints — Natural reddish-brown to purple tones in oils, watercolors, encaustics, fresco, tempera, or historical restorations
• Pyrotechnics & fireworks — Occasional use in iron-rich compositions for warmer reds, subtle spark enhancement, or as a catalyst/alternative iron donor in stars/comets (pairs well with nitrates/perchlorates for earthy tones)
• Art & crafts — Speckling, staining, or antiquing in pottery, sculpture, wood finishing, or decorative finishes
• Experimental formulations — Adds unique reactivity in glazes, pigments, or low-level pyro mixes needing iron with a twist

A small percentage (typically 1–5% in glazes/pigments, or trace in pyro) delivers dramatic depth — disperse in water or medium, incorporate, and achieve results with timeless character. Note: Crocus Martis may contain residual sulfur/impurities — handle as a mild irritant; use PPE (gloves, mask, goggles) to avoid dust inhalation or skin contact. Store cool/dry; in pyrotechnics, test small batches only, as iron sources can sensitize mixes. Follow MSDS and local regulations.

Capture authentic depth and rustic beauty with Crocus Martis — the heritage iron powerhouse trusted by ceramists, artists, and pyro enthusiasts for rich reds and distinctive flair. Stock up now and add that legendary touch to your creations! Add to cart today!