The uniqueness of Lincoln's beard

[Gene C]

In all of the black and white photo's I've seen it looks black

The best source I could find was Abraham Lincoln himself
” If any personal description of me is thought desirable, it may be said, I am, in height, six feet, four inches, nearly; lean in flesh, weighing, on an average, one hundred and eighty pounds; dark complexion, with coarse black hair, and grey eyes — no other marks or brands recollected”