“I’m not talking about the catalyst. I’m talking about the ‘byproduct’ you brought back from Fuyuki.”
“Oh,” Francesca nodded, and flashed a malicious grin. “That couldn’t be helped. I mean, me and Baz are about the only ones who can handle ‘it,’ much less grow it, with our egos intact...
“And I don’t want to always be touching that repulsive ‘mud’! Ahaha!”

Fate/Strange Fake: Volume 3, Interlude ("The End of Escape")