Product Standarization of Ginger (Zingiber officinale Rosc.) and Red Ginger (Zingiber officinale var. Rubrum) Simplicia through Washing Time, Slice Thickness and Raw Materials Drying Process Optimization - Kusumawati, Nita; Department of Chemistry, Universitas Negeri Surabaya, Ketintang, Surabaya, 60231, Indonesia (International Journal on Advanced Science, Engineering and Information Technology, 2017)