Which clearing agent is described as corrosive?

• A. Xylene or Xylol
• B. Carbon-Xylene
• C. Ethanol
• D. Toluene

Answer: (B)

The idea being tested is how the term corrosive applies to clearing agents used in tissue processing. A clearing agent described as corrosive is one that can chemically attack or damage materials it contacts (such as metal vessels or glass) and can cause chemical burns in tissue or on skin with contact. Among common clearing agents, carbon-xylene is noted for having corrosive properties due to its strong solvent action and components that can be aggressive toward metals and other materials used in laboratory equipment. This makes it more hazardous to handle and store, requiring precautions like protective gear and proper containment. Xylene (xylol) and toluene are dangerous irritants and flammable, but they are not typically described as corrosive in the same way. Ethanol is a milder solvent and not classified as corrosive in routine histology use. Hence, carbon-xylene fits the description of a clearing agent described as corrosive.