I recently heard of lumber crayons that are used for marking pieces on boards, particularly rough sawn boards. I'm about to embark on a new project using rough lumber and wanted to gauge how many boards I need. The best way I can think of is to draw it out with a lumber crayon.
But, I'm a cheapo fella, and lazy to boot. I don't feel like going to the local Lowes Depot to buy a crayon when I have tens of thousands hiding in couch cushions, junk drawers, kids' dressers, and some even in the pipes of my house.
So, what's the difference? Can't I just use a crayola crayon?