What is the difference between positive, simple, gram, and negative staining?

The key difference between gram positive and gram negative bacteria is that gram positive bacteria have a thick peptidoglycan layer, hence appear in purple colour while gram negative bacteria have a thin peptidoglycan layer, hence appear in pink colour at the end of the gram staining technique.

Explanation:

yes it is   dangerous

explanation:

because that foot is discusting and could get you sick