Boku-Undo makes beautiful traditional gansai style paints from Japan where they have been in business for over 200 years!. They have a professional level pigment load, re-wet easily, and dry more velvety matte than other gansai paints you may have seen in the past. (They do not perform the same way as Kuretake Gansai, a modern vegan binder alternative to traditional animal-glue, which has a shiny residue when applied thickly.) These colors have a low flow/disperse rate, which can be urged to flow in very wet washes.
A shadow palette means that the base of the color is black and another color is added to it. The scale of diluting each color will provide a wide range of options which will each maintain a high level of saturation of color! The ink pigment in these paints is not waterproof of course so it will flow when re-wetted.
This palette includes: Shadow Pink, Shadow Yellow, Shadow Green, Shadow Blue, Shadow Purple, and Shadow Vermilion. The rich darker hues in this palette will really expand your range of options and will take you into fall really well.