Any operation applied after the crust stage qualifies: dyeing, fat-liquoring to achieve a specific temper, buffing or napping the surface, embossing a grain pattern, or applying a pigment or lacquer topcoat. Even a single finishing step is sufficient to move the leather out of the 'not further prepared' heading. This distinction is important when comparing supplier quotes, as crust and finished goatskin carry different classification codes and potentially different duty rates.

Colorfastness should be tested to both dry and wet rubbing (crocking) and to artificial light exposure using standardized methods such as ISO 11640 and ISO 105-B02. Suppliers should provide third-party test certificates rather than self-declarations for luxury applications. Importers should also specify acceptable gray-scale ratings in purchase contracts, as colorfastness requirements for handbag linings differ from those for exterior panels exposed to direct handling.