Xylene, as described in the material, functions mainly as a clearing agent and is associated with which drawback?

• A. Likely to harden tissue
• B. It increases processing speed
• C. It reduces tissue brittleness
• D. It acts as a fixative

Answer: (A)

Xylene clears tissue by making it transparent and miscible with paraffin, but its strong solvent action can over-dehydrate and remove lipids from delicate structures. This tendency to disrupt tissue integrity makes sections become stiff and brittle, which is a notable drawback when using xylene as a clearing agent. That brittleness can lead to cracking or trouble during sectioning and mounting. So, the described drawback aligns with tissue hardening. The other statements don’t fit because xylene isn’t about speeding processing, it doesn’t reduce brittleness, and it isn’t a fixative.