What is a "staining" Pigment?
Pretty much what it sounds like, a pigment that is very strong and leaves a mark.
Prussian blue is one but not as much of a brute as the Phthalo colors, Alizarin Crimson, most of the Cadmiums, Permanent Magenta, Hansa Yellow, Hooker’s Green, Indigo and Payne’s Gray, among others. Daniel Smith's Anthraquinoid Red, Perinone Orange all the Quinacridones.* Stainers flow beautiful and put down wet, mingle with other colors. As long as the are wet, staining pigments can be lifted and washed back, but once dry, they are a force to be reckoned with. Staining pigments have strong clear color, and can be used well as a first wash. But there is a drawback, if you try to glaze over a stainer with another stainer or worse yet two more, the color on top will kill the under color and flatten the top color out.
*See "Caroline Buchanan: Making Sense of Staining, Sedimentary and Transparent Pigments" an article for Dan Smith here
“I am a contemplative artist who has trouble accessing verbal skills. Finding the right words to talk about the amazing things I observe around me can be frustrating. It is much more natural for me to pick up a paintbrush, some embroidery floss or my camera when I wish to share some new discovery. The artwork I create is meant to be enjoyed on whatever level the viewer experiences it and not layered with complex meaning. Feathers, fur, flowers and the incredible variation I find in wildlife not only inspire me, but compel me to share every nuance with you.