When using a BBW is it advised to use a BBW slurry stone, or is it advised to use a coticule slurry stone?
There are these combo slurry stones available that may fit the bill when using Bart's three stone Diamond/BBW/Coticule method.
Yeah, you want to use a coticule slurry stone for the coticule slurry and a BBW slurry for the BBW slurry. You don't want to mix them
A DMT could work if you don't have a slurry stone.
But yes, those combo slurry stones are great (that's what I have and use )