I was forced to borrow from a gunsmith friend a yellow box with the distinctive Red 'X' of Winchester Western 50-grain Full Metal Case that came with a label that said the box contained 50 Oilproof cartridges.
Industry and academic researchers have worked together to produce nanocoatings for textiles that render silk, woollen, and cotton clothing water- and oilproof, prevent clothing from shrinking, and protect silk from discoloration.