Relying strictly on butter stick wrapper markings carries an unexpected catch: packaging slippage. During automated dairy packing, high-speed wrapping machines roll paper around extruded blocks of chilled cream. Machine registration drifts by 2 to 4 millimeters during typical runs.
If the wax wrapper shifts even an eighth of an inch down the block, slicing directly through the printed lines gives you an inaccurate portion. Check the wrapper alignment before pressing your knife into the butter. The edge of the wrapper should line up flush with the square end of the butter block. If the paper overhangs on one end while leaving butter exposed on the other, the printed markings are offset.
In those cases, use a small kitchen ruler or trim the stick based on total length. An East Coast butter stick (the standard long, narrow shape) measures approximately 4.75 inches long. Dividing the physical length into three parts provides a far more reliable visual cut than trusting a misaligned wrapper.
