The Magnani Aquarello paper actually has BOTH a synthetic sizing and an animal based gelatin. All ranges of this paper have synthetic sizing AKD (Akyl Ketene Dimun) internally then animal gelatin applied externally.
The range of Magnani Aquarello papers distributed here in the USA are double-sized. This means each sheet has internal AKD, external animal gelatin as well as another hit of AKD on top of that. This additional pass of sizing allows liquid to lay on the surface longer for better manipulation of your work. This also provides a workable surface in the event of a mistake whereas the paint can be dissolved and removed without damaging the fibers of the paper itself.
The range of Magnani Aquarello papers distributed here in the USA are double-sized. This means each sheet has internal AKD, external animal gelatin as well as another hit of AKD on top of that. This additional pass of sizing allows liquid to lay on the surface longer for better manipulation of your work. This also provides a workable surface in the event of a mistake whereas the paint can be dissolved and removed without damaging the fibers of the paper itself.