The formula (Uniform Color Of Object OBJ COL) means that all of the visible parts of the tangible thing OBJ have the color the color COL. Hence, this predicate only applies to objects that are entirely one color. For example, the assertion (Relation All Instance Uniform Color Of Object (Liquid Fn Gold) gold) means that all Visible Parts of all instances of (Liquid Fn gold) are gold. This predicate should be used carefully, as it has far more strength than the other color predicates. See also Main Color Of Object and Object Has Color.