Design and optimization of technology for orientation generated indigo in processing of Indigo Naturalis X-ray Diffraction analysis with Fourier pattern of Qingdai Powder Design and optimization of technology for orientation generated indigo in processing of Indigo Naturalis Optimization of modifiers and process for changing superficial hydrophilicity of Indigo Naturalis Separation of Indigo Naturalis by foam flotation technique in a continuous mode Preparation and characterization of Indigo Naturalis-Alumen composite particles based on particle design principle