The color of the liquid you mix for Nafiwaa depends on its concentration of Mythralline. You may receive an extra bonus from Naja when you receive your LC Wildcat Badge depending on the Mythralline concentration of the liquid:
If you check the tubes you will get the following:
Tube #1: Very Light
Tube #2: Same as Tube #4
Tube #3: Very Dense
Tube #4: Reaction is 3 times faster than Tube #1
Tube #5: Density is equal to 1/2 that of the highest concentration.
To get Luminium:
Select 'Start the Process' for the first menu.
Select Test Tube #3 3 times.
Select Test Tube #2 1 time.
Select Test Tube #4 1 time.
Select Test Tube #5 1 time.
Select 'Hand it to the Guild!'
Wait a game day and return to Abquhbah for another cutscene. (You will not be able to trigger this last cutscene until you zone out of Aht Urhgan Whitegate.)
Choose "Helping his fellow mercenaries." and receive your rank.
Client:Naja Salaheem (Salaheem's Sentinels, Aht Urhgan Whitegate) Summary: Falzum, your fellow mercenary, has been given the task of creating a batch of mythralline liquid. As his superior, it is your job to teach him how a mercenary carries out his duty.