Heard bald-faced mostly, though I've also heard bare-faced. (since both are synonymous) Bold-faced is simply a common mistaken repeating of what someone thought they heard. (similar to "hone in", when it should be "home in"....people lack comprehension, and repeat something that is actually merely close to what they heard)
hone makes sense though, since it means refine, make more precise, get sharper (and later on also more focused).
Edit: read up on it a bit more and as I read it, both are accepted, and one only appeared about 10 years (documented version as always in these cases, you are never sure when things Actually were used in speech, only when they first appear in written sources) after the other. So nearly simultaneously, or better yet got altered from early on.
Edit: read up on it a bit more and as I read it, both are accepted, and one only appeared about 10 years (documented version as always in these cases, you are never sure when things Actually were used in speech, only when they first appear in written sources) after the other. So nearly simultaneously, or better yet got altered from early on.