You must have all 3 items listed above in order to open the menu option 'Talk about the Solutions'. He will tell you to talk to Aure Dupon in Geffen for more information. He will not take your items but you need to have them in your inventory to open the option to talk about them.
Mixture and Counteragent Quest - Step 2 - Geffen
Aure Dupon Geffen (181, 114)
East side of Geffen under a street light
Talk to him, ask him More about Morgenstein. He will tell you where to find Morgenstein.
Mixture and Counteragent Quest - Step 2 - Morgenstein
Morgenstein geffen_in (141, 140)
2nd floor of Geffen's [old] Blasksmith Guild 5 o'clock position of Geffen