Liquitex Professional Acrylic Ink made with finely ground artist quality pigments instead of colorants. They dry quickly, are permanent, water resistant and non-clogging, which makes them ideal for a variety of techniques from watercolour effects to stamping. Colour Name - Transparent Raw Sienna - A bright brown single pigment earth color with a yellow undertone and high transparency. Raw sienna is one of the oldest pigments in its natural state and can be found in prehistoric cave art. It is named after Siena, Italy where the pigment was sourced during the Renaissance.