Which solvent is used for infiltration/embedding that is not an epoxy resin?

• A. cellodin
• B. chloroform
• C. ethyl alcohol
• D. xylene

Answer: (A)

The key idea is that embedding media determine which solvent system is used to infiltrate tissue. Epoxy resins (like Araldite or Epon) require solvents such as xylene to clear and carry the resin into the tissue. If you’re using a non-epoxy embedding medium, you rely on a different solvent system. Celloidin is a historic, non-epoxy embedding medium that uses its own solvent system (traditionally ether-alcohol) for infiltration, not the epoxy-resin pathway. That’s why it’s the best choice among the options when asked for a solvent/embedding medium that is not an epoxy resin.