No you don't have to temper Osage but sometimes it helps. I seal my bows with shellac and Tung oil. My shellac had truned darker, it was orange, for some reason. That's why the bow is dark
I am due for a recurve Steve, started one actually. It's a bit off the wall though so it might take me a bit to finish
Lennie. There's Osage, Ash then more Osage then Ash and then a topping of Bloodwood. Actually the limbs have about 5 rings to them, maybe 6