For keeping the original colour of wood I use a product called KTM9. It’s a water based nitrocellulose replacement that’s been used by instrument makers for some time. You can research and buy it on the web from LMI, luthiers mercantile inc. It’s an unbelievably hard finish that stands up to unbelievable punishment and stays clear.
CHRIS, Charlottetown PEI Canada. Anytime you can repurpose, reuse, or recycle, everyone wins!