Dark blue or light blue powder, bright color, strong coloring power, slightly poor hiding power. The silty is hard. Quality standard: coloring force 95~105% oil absorption 15-30% water 1.0%, sieve residue (200 mesh sieve)≤1.0%, water soluble matter 1.0%. Iron oxide blue has high coloring power, good light resistance, poor alkaline resistance, high heat resistance, and the crystal water begins to decompose when the temperature exceeds 150 degrees. Uses: paint, ink, painting, pigment and crayon, paint cloth, paint paper, plastic products coloring, building floor, floor tile coloring.