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A concoction that Shiro Fujimoto offered to Kuro to help tame him. A batch was hidden in a Holy Water Grenade to be used in an emergency if Fujimoto was killed.
It is mistaken to be poison, until Kuro smells it, recognizing it from when Fujimoto offered it to him. 
- ↑ Ao no Exorcist Manga: Chapter 8, page 37