Why having a lipid rich cell wall make a bacteria harder to

Why having a lipid rich cell wall make a bacteria harder to stain?

Solution

In lipid rich cell walled bacteria the alcohol easily pass through the walls making loss of lipid and increasing pores in the membrane thus making the cell wall more porous and the stain is easily washed out distaining the cell. So it is difficult to retain the stain inside the lipid rich cell walled bacteria while staining (Harder to stain).