TLDR: Is there supposed to be a trick to getting a Rika 5k muddy? And is Suehiro really into marketing one 5k product under several names? I have a stone I bought as being "a Rika in everything but name" -- so, supposedly, basically the same 5k Suehiro; but unbranded, unstamped and without the nice box. I like it well enough in use, and would be satisfied that it has all the nice properties which glowing remarks about the Rika made me expect; except for one nagging thing: A burrfection video wherein he experiments with permasoaking his stone and finds that it forms a thick mud; which he says never to have previously seen. (link: www.youtube.com/watch?v=odApnWSnugU&feature=youtu.be&t=506). However, I can't seem to replicate this with my stone. I wonder if there's some first-hand experience of using an official Rika 5k-- as to whether or not Ryky's muddy accident was representative. It's worth mentioning a suggestive blurb, likely related with my dilemma, from the ToolsfromJapan website, under the 'Cerax #5000' description: "Note: this seems to be almost identical to the Suehiro 'Rika', which is well liked and well known. There is a good reason for this..." (http://www.toolsfromjapan.com/store...oduct_info&cPath=335_404_572&products_id=2236) -- also, the pictured Cerax 5050 does look identical to the 5K Suehiro I have. I'm inferring from Stu's comment that the 2 different Suehiro products, Cerax & Rika, are actually the same basic stone; and assuming that's the case, my own stone can just as easily be another rebranding of Suehiro's well-liked venerable 5k. But, if that's indeed the case, and my stone is actually just a Rika is simpler packaging -- then, where's my mud?