Lea polishing compound is the trade name of a long-running family of solid-bar polishing compounds produced originally by the Lea Manufacturing Company of Waterbury, Connecticut, and used widely in the jewellery, dental and metal-finishing trades for buffing and polishing operations on precious metals. The brand has been in continuous use since the late nineteenth century and is still recognised at the bench, although the company has changed hands several times over the past forty years.

The Lea range covers the standard sequence of polishing-compound colours and grits familiar to any jewellery bench: tripoli (coarse cutting compound, brown), white rouge (final polish for silver and white-gold finishes, white), red rouge (final polish for yellow gold and silver, red), green rouge (final polish for platinum and stainless steel, green) and various intermediate cutting compounds for use on felt, muslin and stitched-cotton wheels. The compounds are sold as solid bars or sticks, applied to a spinning buff by holding the stick lightly against the wheel and letting the wheel pick up a thin coat of abrasive-loaded wax.

For the working bench, the practical interest of the Lea brand is consistency: the bars cut to known specifications across batches, the compound stays loaded on the wheel for predictable working time, and the residue can be removed with standard solvent or ultrasonic cleaning. It is one of several brands (Dialux, Menzerna, Picard) that occupy the same market segment, and the choice between them is mostly a matter of bench preference rather than fundamental performance difference.