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.
Intrinsic stains are rarer and can be caused by many factors such as the use of tetracycline, severe cavities during early childhood, or changes with the tooth's nerve due to trauma or high doses of fluoride in the natural water supply. Discolored or dark teeth may be a sign of previous trauma to your child's tooth.