 Special Effects Property Master William Sapp created the effects  that turned the waters of the Nile red. Red dye was pumped into the  water through a hose at the point where Aaron touches his staff to  the river. Sapp also created the vessel that was used by Rameses  priest in an attempt to restore the waters. The vessel had two  chambers: one that was filled with clear water and which was located  near the vessels opening; while the other chamber that was filled  with red