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Brilliant photo there Oz, that says it all!

Well, this is how I see it:

A solid piece of wood is also made from the same stuff that tissue paper is made from, but if you' re wiping your blade with tissue paper and a small piece slides over...

You will probably ruin the edge if you do that to an already "shave ready" razor. That is an excellent test, but only while you are honing the razor, and should not, IMO, even be used on the smootest...

+1 on Oz's comment. Get yourself a cheap disposable straight razor to compare the blade to one that is definitely sharp.

Good luck!