If you want to get really picky, platinum and Van Dyke and cyantoype are technically not emulsions either, since the sensitizer is applied directly to the base and is not dispersed evenly in a 'carrier' layer that sits on top of the base. In a silver gelatin print, the light sensitive silver compounds are suspended in a layer of gelatin. In most hand coated alt processes (excluding albumen, in which the albumen is the carrier layer) the light sensitive compounds are applied directly to the base and are soaked up by the paper fibers.