Which of the following is a determinant of a good clearing agent?

• A. Cost.
• B. Removal by paraffin.
• C. Flammability.
• D. All of the above.

Answer: (D)

A good clearing agent must balance practical performance with safety. Cost matters because clearing is used on many slides, so an affordable option keeps the process economical. It also needs to be removed readily by paraffin, meaning it must be miscible with paraffin so it can be displaced during infiltration without leaving residues that would interfere with embedding or subsequent sectioning. Safety and handling are important as well; a clearing agent that has lower flammability or fewer hazardous properties reduces risk to staff and simplifies storage and use. When an agent meets these practical, compatibility, and safety considerations, it becomes a well-rounded choice. That’s why all of the above factors together determine a good clearing agent.