The movement of surface water into rock or soil through cracks and pore spaces is called

The movement of surface water into rock or soil through cracks and pore spaces is called infiltration. Infiltration (HVAC), a heating, ventilation, and air conditioning term for air leakage into buildings. Infiltration (medical), the diffusion or accumulation of substances not normal to it or in amounts in excess of the normal.

The answer is joseph is observing the colour of the reaction mixture to see whether proteins are present in the given solution.