"They shouldn't be, no. I can improve memory, attention span, wakefulness...it's about finding the right combination of herbs." 

"Oh, all right. Then all of the above, if you don't mind."

"I'll just prepare the ingredients."

He goes to the back, leaving her with Scott.

"Let me see if there's anything in here about making the book be. Less like a stalker that hides behind my eyelids," mutters Yvette, and she gets to looking for instructions on that.

Scott lets her read. 

"... There's at least one way to make it less stalky, but I'm not sure I like it."

"We keep running into that here. Do I want to hear it?"

"It involves eldritching my eyes so I can just read the contents of the book whenever I want."

"Is that as bad as it sounds? It sounds pretty bad, Yvette." 

"It doesn't sound like it'd be madness inducing or painful, but. I did describe it in an unfriendly fashion for a reason."

"Which seems worse? Changing your eyes permanently is extreme, but how bad will seeing it like that get? Does it feel the same every time?"

"Do I feel the same thing about it every time, you mean? Because it doesn't feel like anything, I just see it."

"Right. I guess we won't know if there are long-term effects, since you haven't really been changed by it yet." 

And Dr. Deaton returns, with a cart carrying a variety of jars.

"Alright, let's get started. This should only take a few minutes, Yvette." 

"Sure. I'm not going anywhere."

She is, after all, still in the circle.

So he mixes some ingredients, and after a few minutes, walks towards her. 

He clears the powder with his foot, and raises his hand, coated in a mottled brown sludge.

"May I? I can apply it to the forehead. Symbolism doesn't really matter, but it should be easier to wash off, later." 

"Sure, paint away. Just tell me what I need to do."

"Nothing at all. Just keep still."

He applies it to her forehead.

It's cool, and she feels it begin to warm on her skin. 

That's all she feels.

"... Is it supposed to feel like anything in particular?"

"...Yes, yes it is. I hadn't actually considered this, but I should have. I assumed that even though the mountain ash blocked you, this would be fine, but I should have considered it. It's possible none of my usual techniques will work on you. I can try something else, if you'd like to see if it's a broad incompatibility."

"I'm willing to test for it, just as long as you have the resources to spare for it."

He nods.

"There's not much we can try, given that failure. There is something. Temporarily increases mental processing speed. Rarely used because of the abrupt absence when it runs its course." 

"Sounds fun, let's give it a try. For magical science."

So he mixes a few seeds and some leaves in a glass of water, and passes it to her.

"Drink that, and if it works, you'll have half an hour."

So she drinks it.

"... Still nothing. That's disappointing."