Putting dacron tanbark sails on a traditional boat, may seem more authentic, but since you can tell dacron from natural fibers its more of a poser move than a move that adds authenticity.
Oh lighten up...
What sailor is not a poser? We deliberately choose a less reliable form of propulsion not because it makes sense, but rather because we like the way it doesn’t. We trim our boats with non-functional teak. We wax, we polish. We invite the neighbors our for an evening cruise. It’s just us and the elements, and our GPS, our radar and our microwaves.
Show me a sailor who doesn’t kowtow to the aesthetic and I’ll show you a commercial fisherman. The rest of us pose. Some more, some less, but pretending that one is above the fray is posing par excellence.
I am glad that with all of the factual, technical information that has been provided, you only chose to focus on the one subjective point in that post. Like any purely subjective point of view, if in your mind, you feel that tanbark sails add to the authenticity of appearance and that out weighs the poorer durability, higher cost, and poorer sailing ability, then buying tanbark sails makes sense for you.
The nice thing about subjective opinions, is that those of us who understand the issues with tanbark color Dacron and who are students of historical watercraft, are equally correct thinking of tanbark Dacron on a traditional boat in the same way we might think it to be as silly as adding tailfins on a minivan in an effort to create a retro look.
But in fairness, personally I think of boats as sophisticated tools that gain their aesthetic validity bfrom the integrity that comes from the honesty of it's design ethic, build quality and use of materials.
So hey, maybe that was just my opinion. Your mileage may vary.