To make a recipe you may need up to 4 different ingredients: For "normal" recipees you need green quality material either harvested from nodes, from gathering missions or from the GTC. You might need more than one kind of greens higher up the list. But I dont know. For blue recipees ,(RE or trained) you need a second component - blue materials gained from aending your companion on appropiate missions or the GTC. If you really lucky hou get purple items hete as well used for your best recipees. Observe that you can gain green, blue or purple recipees on all crew skill levls! The Grade/tier of material needed is also shown if you click the material.