Which is a problem associated with 95-100% Ethyl Alcohol fixation?

• A. Excessive hardness & shrinkage
• B. Enhanced tissue pliability
• C. Increased staining variability
• D. Improved antigen preservation

Answer: (A)

High-concentration ethanol acts as a dehydrating fixative, removing water from tissues and coagulating proteins. This rapid dehydration causes the tissue to become tightly packed, leading to hard, brittle specimens that shrink as they fix. The resulting hardness and shrinkage distort morphology and create difficulties in microtomy, producing artifacts and uneven sectioning.

That’s why this option is the best answer: the major downside of using 95–100% Ethyl Alcohol fixation is the excessive hardness and shrinkage it induces. Other effects like increased pliability or improved antigen preservation aren’t characteristic of this fixation method; in fact, antigen preservation is often not improved and tissue pliability is usually reduced with strong dehydration fixatives, with staining variability being a possible secondary issue rather than the primary problem.