For those interested who didn't read the whole thread, those pictures and much more information are in the first link I posted in the first reply to this thread.
That page also covers the sodium nitrate method with instructions and photos for comparison. You can buy sodium nitrate at Walmart, some drug stores, Amazon, probably more than you and SMC can use in a lifetime.
Andrew, a distinctive smell is one excellent way to identify woods once you learn them. Unfortunately, a smell is a hard thing to quantify and relay to another person. I've always wanted a scratch-and-sniff card on each page of my favorite wood ID book! If you are exceptional at that I should send you some samples of some I have with distinctive smells but totally unfamiliar to me! Weight/density is another tell but doesn't help with the oaks. Fluorescence is great for some species such as the locusts.
JKJ