I've just this past weekend sanded my living and dining-room floor boards and they looked fantastic after I had finished. I love their natural colour. However, every varnish I've tried (on test spots under where our couch goes) darkens the wood even those that say 'Crystal Clear Varnish'. I've tried both oil and water based and have used no stain what-so-ever. I'm at my wits end because I want them to stay their natural colour but also want to varnish them to protect them. Any advice, please?