Kuretake Gansai Tambi Granulating Colors are solid watercolor paints from the Gansai Tambi range. You mix them with water before use. "Granulating" means the color separates after you paint it, so you can see more than one color in the same stroke.
The set has 5 colors and one empty pan, which you can use for mixing paint with water. The colors are not sold one by one.
The way the colors separate and bleed changes with the type of paper. For a stronger color change, mix the paint with plenty of water and let it separate in the palette before you paint.