Knife2meatu
Senior Member
King Deluxe 300/400 and Neo 800 are all vitrified alundum (AlOx) stones according to Matsunaga, so that's that for this discussion I suppose.
That settles that, then.
I can't remember ever seeing anything indicating that vitrified bond stones could be damaged by submersion in water -- Hence, based on what I think I know, I assume there should be no way that prolonged soaking should damage the King 300.
In light of this, I'm really quite surprised at how very different it becomes after permasoaking for a while.
It showed much more change from permasoaking than other stones. Notably more than Cerax 320/1k/6k/8k; King 800/1k/1200; Imanishi Bester 220/700/1.2k; Sigma Power Ceramic 120/1k/2k; Norton India coarse/fine and Crystolon coarse/fine -- among others.