Citadel Technical: Ryza Rust If you're painting rust, Ryza Rust should part of your paint collection. It's a Citadel Dry paint, meaning that you apply it with a drybrush on your miniatures. It's been specifically designed to be used with Typhus Corrosion, and the two should be used together to get the best effects. This pot contains 12ml of Citadel Dry: Ryza Rust. As with all of our paints, it is a non-toxic, water-based acrylic paint designed for use on plastic, metal, and resin Citadel miniatures.