1 Used other than as an idiom: see outer ,â core. ( 2 planetology) The hot liquid material found near the centre of some planets, distinct from the solid inner core. ( 3 geology) The part of the Earth between the mantle and inner core, responsible for generating the planet's magnetic field. 4  Link/Cite.
Differential Staining is a staining process which uses more than one chemical stain. Using multiple stains can better differentiate between different microorganisms or structures/cellular components of a single organism.
The final and third. step is applying a counter stain. A counter stain is used to stain all unstained biological. materials. Counter stains are usually a contrasting color to the primary stain. With the. Gram stain, the primary stain colors the cells violet and the counter stained bacteria are. red. Violet cells are âGram positiveâ because they have reacted to the stain.