From ErfWiki

Canon

A Scroll is a magic item. It is a physical storage device for a single spell, which can be used only by a Caster. Casters may create a scroll or scrolls on their turn, for a significantly higher cost in juice than simply casting the same spell.

Speculation

A scroll with a spell of the same Discipline as the Caster has a greater effect than one cast by a different Discipline.^Erf-b1-p006