Metal Marking Ink is the easy solution to all special marking applications including Datum marks on railway tracks and equipment. It is also ideal for highlighting areas that may need to be replaced or repaired. Metal Marker is conveniently sized to be carried in the pocket and has the ability to write on wet, rusty and even oily surfaces. Also available is Super Metal Marker providing the added advantage of being able to write in fine detail. Super Metal Marker is available in both white and yellow.