Kobe inks may not be unique in colour, but they're so nicely shading and well behaved, they're worth it over others. Kobe #56 looks in colour like a darker Iroshizuku Murasaki, albeit with more shading. I prefer it to Murasaki, which is quite flat on most papers. If you like a shading purple that leans blue instead of red, you can't go wrong with Kobe #56!