A high carbon cast iron powder suitable for sintering, melting, fireworks, and hand warmers. May also be used as a filler in resins or added to concrete for a rust effect. Includes some clumps naturally formed due to stacking pressure, which can be removed by re-screening, chopping, or grinding. Suitable for wood stains when mixed with vinegar, with clumps gradually disintegrating. Particles are slightly hydrofoabic to reduce fire risks; surfactant recommended for increased wetting properties in specific applications.