The ales of Scotland generally have a malt accent. In their home country, a single brewery's products may be identified in ascending order of gravity and strength as Light, Heavy, Export and Strong. Or by a system based on the old currency of shillings, probably once a reference to tax ratings: 60/-, 70/-, 80/-, 90/-. Alcohol content by volume might rise through 3, 4, 4.5 and 7-10. The term "Scotch ale" is something used specifically to identify a very strong, and often extremely dark, malt-accented speciality from that country.