Paraffin sections that display microscopic chatter are the result of which blade tilt condition?

• A. Too Little Blade Tilt
• B. Too Much Blade Tilt
• C. Dull Blade
• D. Processing Error

Answer: (B)

Chatter marks come from instability in the cutting action, and excessive blade tilt is the condition that creates that instability. When the knife is tilted too far, the edge engages the tissue at an excessive angle across the block, causing uneven contact and tiny vibrations as the blade moves through the paraffin. This results in fine, parallel ridges visible on the section—microscopic chatter. The fix is to reduce the blade tilt to a proper, smaller angle and confirm the blade is sharp and correctly mounted, along with ensuring smooth sectioning conditions. A dull blade tends to cause tearing or ragged edges rather than the regular chatter pattern, and processing errors relate to tissue preparation rather than the cutting geometry.