Natural iron oxide is the basis for this single-pigment color, named after the region in Italy where it was first mined. Raw Sienna retains more of its yellowish color because is created prior to the heating process that creates "burnt" sienna. ASTM Lightfastness I (Excellent); Semi-Transparent; Pigment(s): PY43 (Natural Hydrated Iron Oxide); Vegan VERSATILITY - Blends easily with all acrylic colors, and readily tint gels, mediums, gessoes, and grounds, making them extremely versatile for various techniques including fine brushwork, glazing, staining, water media techniques, and more TECHNIQUE - Fluids allow for smooth flowing applications while retaining color intensity, tinting strength, film integrity, and adhesion Made in the USA with globally sourced materials by an employee-owned company with more than 40 years of experience making paint for professional artists GOLDEN FLUID ACRYLICS have an even, flowing characteristic with a viscosity similar to heavy cream while maintaining the same pigment load as Golden Heavy Body Acrylics. Fluid Acrylics blend easily with all acrylic colors, and readily tint gels, mediums, gessoes and grounds. They are extremely versatile, and ideal for even coverage of large areas, fine details, glazing, staining, water media techniques and more.