We are having a guest board as our guest book for guests to sign. I am having trouble figuring out what sort of markers I should buy for the guests to use. At first I thought of silver sharpie, but I cannot find any that have an ultra fine tip as I think that just fine tip might still be too thick to write with. Does anyone have any recommended brands or maybe someone did use the fine tip sharpie and saw that it worked well?? Thanks!!