i grease them burnish and in time they age. a pure white bow made of American elm has gone from pure white to a tannish/yellowish with a toasted belly .took about a month.love the looks of it now. to make it pretty i burnt in some decorations on the belly side.sometimes i stain the tips.i like decorating the belly more than anything. gives me something nice to look at in between shooting.if it looks all glassy shiney. i dont like it. any colorations i use are natural . like walnut husks, poke berries, trumpeter vine flowers, grass, stuff like that. i dont like my bows to look too walmartish.Tony