Princeton Artist Brush Catalyst Silicone Mini Blades, for Food Crafting, Ceramics, Plaster, and Heavy Acrylic Media, Mini Blade No. 6 White Catalyst tools are crafted from flexible silicone to allow artists a new form of expression. Catalyst Mini Blades are mounted on artist brush handles offering a blend of tradition and innovation. Designed for use with heavy-bodied paints, Catalyst is at home with oils, acrylics, and water-miscible oils. Because they are heat-resistant, they excel with encaustics. Artists are using them with plaster, clay, and even frosting. Made of FDA-approved silicone, Catalyst Blades are great for food crafting.