Which term describes reagents that perform both dehydration and clearing in tissue processing?

• A. Universal solvents
• B. Water soluble wax
• C. Infiltration media
• D. Embedding media

Answer: (A)

The idea here is to use a solvent that can handle two key steps in one: removing water and preparing the tissue to accept embedding medium. Reagents called universal solvents are designed to do both dehydration and clearing because they can dissolve water (replacing the alcohols) and also be compatible with the solvent used to replace them before embedding. This means the tissue can move smoothly from dehydration toward embedding without needing two separate solvent exchanges, saving time and reducing tissue handling.

Water-soluble wax, infiltration media, and embedding media each serve different roles in the workflow. Water-soluble wax is a type of embedding medium that can be dissolved in water, but it doesn’t perform dehydration or clearing. Infiltration media are used to carry the embedding medium into the tissue, and embedding media (like paraffin) provide the solid support for sectioning. None of these are about removing water or clearing tissue.