Go to a fabric store and buy some velcro strips. Separate the two sides and take the side that is cloth and soft , the loop side (not the hard prickly plastic hook side). Glue it to the edge of a wooden tanto, and apply marking chalk (like found at a lumber yard). This is a great cheep way to make a very durable marking knife.
Very tricky, Mr. Bond. Very tricky.
Thanks for the suggestion,Chris!