The president's supporters appear to share his penchant for the black permanent marker, with one fan in the inaugural audience calling for Trump to toss him a pen after signing an order with it.

And one thing onlookers have noticed: Trump uses a black Sharpie marker to sign the orders. Video footage and pictures from the Oval Office show Trump wielding the markers and leaving signatures ...

We report a vesicular reaction close to patch-test sites that had been previously marked with an Edding 3000 permanent marker ... a red-colored Edding 3000 marker pen (Edding International ...