Question

why is safranin used to prepare the temporary mount of a leaf peel

Answer 1

To give colour to the cells. Safranin is used to stain the peel.

Answer 2

To observe the very small biological objects which is barely visible with our naked human eyes,we use microscope to optically zoom in that small biological object.

But we often use colour stains to observe these small objects.Because these objects are often transparent or translucent which makes the observation process difficult.

That's why we use colour stains to efficiently perform the microscopic observations.