i use high temp barbeque paint from wall-mart.(flat black)
the scribe lines are easy to see and they the marks don't burn of if you get it to hot while grinding.
If you use permanent marker, it won't wash away. I accidently used a "washable" marker for layout once. It didn't work out too well when I dipped the bladed in water for cooling.
Aaron, Layout Dye is cheap, and much better to use. However, if you get into a bind where you have none, a permanent marker is just fine. The idea is to color the areas you want to scribe then scribe over the marker. I have a friend who has been a machinist for over 40 years and he taught me that trick.
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