Now you just need a pair of suspenders.

Hi Comms, Soapstone will not write on everything.
Soapstone is for welders marking steel. The thing is it leaves a white mark that does not burn off when a torch hits it.
You will see it in little sticks wherever welding supplies are sold.
It is useless on paper.

grease pencil is good, so are soft carpenters crayons (not pencil) You usually see them in black(graphite)and black, red or yellow wax. (Building supply stores.)