The phrase "in permanent marker" is grammatically correct and can be used in written English.
Example: The graffiti on the wall was written in permanent marker, making it difficult to remove.
On the door, in permanent marker, was written, "I Hate This Part of Texas".
Police said they would investigate the 15 swastikas drawn in permanent marker and racist graffiti such as "not white?
Inside the 30-acre park, the concessionaires included a "blacksmith" who wrote visitors' names in permanent marker on tiny horseshoes.
They write messages on the balloons: "We will remember the little guy," one passer-by wrote in permanent marker.
One Christmas a few years ago, my mum asked us to write our thoughts on the future in permanent marker on placemats.
An aubergine with a rude message written on it, presumably in permanent marker that won't wipe off its smooth, shiny flesh.
Ms. Poehler said Upright Citizens Brigade had a tradition of writing the phrase "Hot Chicks Room" on unappealing spaces in the theaters it operates -- usually in black permanent marker and usually to indicate rooms where the beer supply is kept.
There was a group of lads that used to write in big, permanent marker "Shaun is queer", "Shaun is gay" over the street signs and bus shelters in the town where I lived.
Not when he covered our door and the area around it with expletives in orange permanent marker, not when we went down to his apartment to ask for an explanation (he never, ever answered), and not in the basement or hallway, on the elevator or stairs.
The pistol currently has the case number written on it in silver permanent marker.
The officer took a photograph of the graffiti, which read "gAUST" in black permanent marker.
