[Bortz wordlessly angles their arm so she can see the results of her work better. They're quiet for a moment, frowning -- so, their default expression, but it's a thoughtful sort of frown here. They're certainly no scholar themself, and they definitely spent the least time in Rutile's lab of anyone. Their input is likely unnecessary.

But if it might be at all helpful, if it might aid in creating something reliable for emergencies...]

Someone else suggested I try a mix of tree sap and charcoal. It makes a solid enough paste, but it has to be heated and applied immediately before it cools so it's inconvenient.