The butter knife is a table knife intended for serving butter and applying it to bread and crackers[2] ("spreading"). These utensils are also used for soft cheese, pâté, and moulded jelly when the more specialized knives are not available.[3]
During the Victorian era, a multutude of knife-like implements were invented to handle butter. The Victorians distinguished:
The use of bread knives in the modern formal dining is closely tied to the bread-and-butter plate (B&B). In the table setting, the spreader is laid on top of the B&B plate, either vertically, horizontally, or diagonally.[9]
The availability of butter on the dining table varies with culture and setting and is closely related to the use of (otherwise dry) bread:[10]
In the Middle Ages, the trenchers were made of bread, but were not considered food, except by the poor, the bread intended for eating was served separately, on the left side (where the B&B plate is set up nowadays). A small dish, 2+1⁄2 to 3+1⁄2) inches in diameter, was used to hold a mound ("pat") of butter, and was called a butter pat. During the Victorian specialization "craze", two separate plates were used, one for bread and one for butter. The tendency of simplification after the First World War caused the plates to be combined into a single modern B&B one.[10]
If no butter spreaders are provided, a dinner knife may be used as an alternative.[11]