Recently I decided to buy a sharpening stone. Now this may be a dumb question, but I find it really difficult to decide what side is the 'course' side, and what side is the 'fine' side. It has a two-tone construction and the instructions (which I've lost) definitely said it was course/fine. I've tried running my fingernail along each side but I can't tell with any confidence which side is which. Is it just me?
If it is coarse/fine and you really can't tell by inspection, you can hear/feel the difference when sharpening something as the fine side is smoother in operation.
Some of this may depend on the quality of the stones. I have two of these two sided stones. One was a present, whose source I do not know, but it has a distinctly different pair of surfaces that are easily told apart: this is how stones 'always used to be' in my memory at least. My other one is a cheapo, from Wilkinson's, and it is indeed more difficult to tell the sides apart, and it also gives a sickly rubbery smell when in use.
I might like to add that there are probably different grades of two-sided stones too. My dad's one - probably still in use! - had the typical pink hard honing surface on one side and fairly coarse grey on the other. No mistake possible there (they used to have similar things on a smaller scale inside the old Ronson razor boxes that used to be found in vast numbers at jumble sales...). On the other hand, a met lab that kept my fingers well ground down polishing all sorts of metal prior to hardness testing, had a row of stones on an inclined plane with water permanently running down it. Going through the grades, a mirror finish was nearly obtained, and then made good on a lapping wheel with diamond paste (spectacular results when odd shaped magnet cores dug into the spinning fabric and were hurled across the room...)
What I really used to like were the little 'Tam-o-Shanter' green, spotty, honing sticks, which I used to find so useful for putting the final finish on all kinds of edges (including my finger nails, to get just the right sound from a nylon guitar string...). Sadly, these seem to have disappeared: I did track down a web reference to the firm and write to it a year or three ago, but never got any reply.
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