Fluid produced by wounds plays a crucial role in healing. This is called exudate, and there is more than one type. Here is what you need to know. 1. Serous is a Green Wound Drainage : How to treat at home (with demonstration) 1950's Peggy Hunt Green Watercolor Floral Silk Portrait Collar Pleated Timeless Vixen Kellsini Floral Maxi Dress in Sage Green Altar'd State Purulent Drainage: Causes, Signs & Effective Treatment Options Wound Drainage Types: Serous, Sanguineous, Serosanguineous, and Purulent