  We investigate both experimentally and numerically the impact of liquid drops
on deep pools of aqueous glycerol solutions with variable pool viscosity and
air pressure. With this approach we are able to address drop impacts on
substrates that continuously transition from low-viscosity liquids to almost
solids. We show that the generic corolla spreading out from the impact point
consists of two distinct sheets, namely an ejecta sheet fed by the drop liquid
and a second sheet fed by the substrate liquid, which evolve on separated
timescales. These two sheets contribute to a varying extent to the corolla
overall dynamics and splashing, depending in particular on the viscosity ratio
between the two liquids.
