Fig. 4
From: Ammonium alum in alum-treated wooden artefacts: discovery, origins and consequences

Mass of precipitate produced by heating identical amounts of alum solutions (40 g alum with 20 g water) over time
From: Ammonium alum in alum-treated wooden artefacts: discovery, origins and consequences
Mass of precipitate produced by heating identical amounts of alum solutions (40 g alum with 20 g water) over time